Υπέβαλα την αίτηση αποζημίωσης, μα όχι τη μαρτυρία.

Υπέβαλα is the 1st person singular simple past of υποβάλλω (to submit / to file).

So it means I submitted or I filed.

A few useful points:

• υποβάλλω = present tense, imperfective aspect
• υπέβαλα = past tense, perfective aspect, referring to a completed action

In this sentence, it presents the submission as a single completed event.

Both την αίτηση and τη μαρτυρία are in the accusative case, because they are the direct objects of Υπέβαλα.

• η αίτηση = the application / claim
• την αίτηση = the application / claim (accusative)
• η μαρτυρία = the testimony / witness statement
• τη μαρτυρία = the testimony (accusative)

Since I submitted something, Greek marks those somethings as direct objects in the accusative.

Both την and τη are forms of the feminine accusative singular definite article.

• την is the full form
• τη is a very common shortened form used before many consonants in everyday writing and speech

So:

• την αίτηση is used because the next word begins with a vowel
• τη μαρτυρία is the shortened form before μ

This is completely normal Greek usage.

αποζημίωσης is the genitive singular of αποζημίωση (compensation).

So:

• η αποζημίωση = compensation
• της αποζημίωσης = of the compensation

In η αίτηση αποζημίωσης, the genitive works like an application/claim for compensation or compensation claim.

This is a very common Greek pattern:

• αίτηση εργασίας = job application
• σύμβαση εργασίας = employment contract
• αίτηση συμμετοχής = application for participation

So αίτηση αποζημίωσης is a noun + genitive structure.

Literally, yes, it is something like application of compensation, but that is not how you should understand it in natural English.

In Greek, a noun followed by a genitive noun often expresses ideas that English may translate with:

• for
• a compound noun
• another natural paraphrase

So αίτηση αποζημίωσης is better understood as:

• compensation claim
• claim for compensation
• application for compensation

The exact English wording depends on context.

μα means but.

In this sentence:

• ..., μα όχι τη μαρτυρία. = ..., but not the testimony.

Compared with αλλά, μα is often:

• a little shorter
• slightly more direct or conversational in many contexts
• very common in both speech and writing

In many sentences, μα and αλλά can both work:

• Υπέβαλα την αίτηση αποζημίωσης, αλλά όχι τη μαρτυρία.
• Υπέβαλα την αίτηση αποζημίωσης, μα όχι τη μαρτυρία.

Here they are very close in meaning.

Because Greek is omitting a repeated verb that is easily understood from context.

The full idea is:

• Υπέβαλα την αίτηση αποζημίωσης, μα δεν υπέβαλα τη μαρτυρία.
• I submitted the compensation claim, but I did not submit the testimony.

Instead of repeating υπέβαλα, Greek uses a shorter contrast:

• ..., μα όχι τη μαρτυρία.

This kind of ellipsis is very common and natural in Greek, just as in English:

• I submitted the claim, but not the testimony.

Because όχι is used here to negate the noun phrase, not to negate a full verb clause.

Compare:

• Δεν υπέβαλα τη μαρτυρία. = I did not submit the testimony.
• Υπέβαλα την αίτηση, μα όχι τη μαρτυρία. = I submitted the application, but not the testimony.

So:

• δεν negates a verb
• όχι can negate or reject a word or phrase, especially in contrasts

That is why όχι is the correct choice here.

μαρτυρία usually means testimony, witness statement, or sometimes evidence, depending on context.

It comes from the idea of bearing witness.

In legal or administrative contexts, it may refer to:

• a witness statement
• testimony
• a formal account given by a witness

A learner should note that μαρτυρία is not always used in exactly the same situations as English testimony, so the best translation can depend on context.

It is mostly neutral to somewhat formal.

Some clues:

• υπέβαλα and αίτηση αποζημίωσης sound administrative or official
• μα gives it a slightly more direct, natural flow

So the sentence could easily appear in:

• a formal explanation
• an email
• a statement about paperwork
• spoken discussion of a legal or administrative matter

It does not sound slangy.

Because μα connects two contrasting parts of the sentence, much like but in English.

The comma helps separate:

• Υπέβαλα την αίτηση αποζημίωσης
• μα όχι τη μαρτυρία

So the punctuation reflects the contrast:

• I submitted the compensation claim, but not the testimony.

This is standard punctuation.

Yes, Greek word order is fairly flexible, though each version may shift emphasis slightly.

The original:

• Υπέβαλα την αίτηση αποζημίωσης, μα όχι τη μαρτυρία.

This sounds natural and neutral.

You could also see emphasis placed elsewhere, for example:

• Την αίτηση αποζημίωσης υπέβαλα, μα όχι τη μαρτυρία.

That version gives extra focus to την αίτηση αποζημίωσης.

Greek often uses word order to highlight what is being contrasted or emphasized, even when the basic meaning stays the same.

They are:

• η αίτηση = application, request, claim
• η αποζημίωση = compensation
• η μαρτυρία = testimony, witness statement

And their forms in the sentence are:

• την αίτηση = accusative singular
• αποζημίωσης = genitive singular
• τη μαρτυρία = accusative singular

All three nouns are feminine.

Yes, very possibly.

The noun αίτηση can mean several related things depending on context:

• application
• request
• petition
• claim

So αίτηση αποζημίωσης may be understood as:

• compensation claim
• claim for compensation
• application for compensation

If the context is legal, insurance-related, or administrative, claim may sound more natural than application in English.