Ο συνδικαιούχος υπέγραψε.

Ο is the definite article in Greek, meaning the.

In this sentence, ο συνδικαιούχος means the co-beneficiary / the joint account holder / the co-entitled person, depending on context.

Here, ο is:

• masculine
• singular
• nominative case

It matches the noun συνδικαιούχος.

Συνδικαιούχος is a formal word. It is commonly used in legal, financial, and banking contexts.

It is made up of:

• συν- = co-, jointly
• δικαιούχος = person entitled, beneficiary, claimant, holder of a right

So συνδικαιούχος usually means something like:

• co-beneficiary
• joint beneficiary
• joint account holder
• co-holder
• person jointly entitled

The exact English translation depends on the situation.

Yes, συνδικαιούχος here is masculine singular, which is why it takes the article ο.

The feminine form is usually:

• η συνδικαιούχος

This is one of those Greek nouns where the masculine and feminine often have the same noun form, and the article shows the gender:

• ο συνδικαιούχος = the male co-beneficiary
• η συνδικαιούχος = the female co-beneficiary

Υπέγραψε is the simple past form, also called the aorist.

It means:

• signed
• did sign

It refers to a completed action in the past.

So Ο συνδικαιούχος υπέγραψε means that the signing happened and was completed.

Because Greek often expresses past tense with one verb form, not with an auxiliary like English does.

In English, you might say:

• signed
• did sign
• sometimes, depending on context, something close to has signed

In Greek, υπέγραψε already contains the past meaning by itself. You do not need a separate word like did.

So:

• υπογράφει = he/she signs / is signing
• υπέγραψε = he/she signed

Υπέγραψε is third person singular.

That means it can mean:

• he signed
• she signed
• it signed (depending on the subject, though that would be unusual here)

Greek verbs in this form do not show male vs female. The subject noun tells you the gender if needed.

In this sentence:

• ο συνδικαιούχος tells you the subject is masculine
• so here it means he signed

If the sentence were:

• Η συνδικαιούχος υπέγραψε it would mean:
• The female co-beneficiary signed
• She signed

The dictionary form is υπογράφω, meaning to sign.

Some important forms are:

• υπογράφω = I sign / to sign
• υπογράφει = he/she signs
• υπέγραψε = he/she signed

This verb changes its stem in the past:

• present: υπογραφ-
• aorist: υπέγραψ-

That is normal for this verb and for many common Greek verbs.

The initial ε- is part of the past formation often called the augment in Greek.

In many past-tense forms, especially in the aorist and imperfect, Greek adds this ε- at the beginning:

• γράφω → έγραψα
• υπογράφω → υπέγραψα
• υπογράφει → υπέγραψε

Because υπογράφω already begins with a prefix (υπο-), the accent and the shape of the past form can look a little different from what a beginner expects. But the important thing is simply to learn υπέγραψε as the normal past form meaning signed.

Yes, Greek could also say:

• Ο συνδικαιούχος υπέγραψε
• Υπέγραψε ο συνδικαιούχος

Both are grammatical.

Greek word order is more flexible than English because case endings and verb forms already show who is doing what.

Very roughly:

• Ο συνδικαιούχος υπέγραψε = neutral, straightforward
• Υπέγραψε ο συνδικαιούχος = may sound a bit more focused on the action, or may fit better in context

English usually needs a more fixed order:

• The co-beneficiary signed

In most normal situations, ο would stay there.

• Ο συνδικαιούχος υπέγραψε = The co-beneficiary signed

If you remove the article:

• Συνδικαιούχος υπέγραψε

it sounds less natural in ordinary neutral Greek unless there is a specific context such as:

• headlines
• notes
• legal shorthand
• very telegraphic style

Greek uses the definite article more often than English in many contexts, so learners should not drop it too easily.

A rough pronunciation guide is:

• Ο = o
• συνδικαιούχος ≈ seen-dee-keh-YOO-hos
• υπέγραψε ≈ ee-PEH-ghrap-se

A few helpful points:

• συν- here sounds like seen-
• αι is pronounced like e
• ού sounds like oo
• χ is a rough sound, like the ch in German Bach or Scottish loch
• γρ in υπέγραψε is pronounced together, roughly ghr

The stress falls on:

• συνδικαιούχος
• υπέγραψε

The grammar is completely normal, but the noun συνδικαιούχος is fairly formal and specialized.

You are especially likely to see it in:

• banking documents
• contracts
• legal paperwork
• official forms

The verb υπέγραψε is everyday Greek, but the whole sentence sounds like something from an official or administrative context:

• The co-holder signed
• The joint beneficiary signed

You would change both the article, the noun, and the verb:

• Οι συνδικαιούχοι υπέγραψαν.
• The co-beneficiaries signed.

Changes:

• ο → οι = the for plural
• συνδικαιούχος → συνδικαιούχοι = plural
• υπέγραψε → υπέγραψαν = they signed

So Greek agreement works across the sentence:

• article + noun + verb all match the number of the subject

You would usually say:

• Ένας συνδικαιούχος υπέγραψε.

That means:

• A co-beneficiary signed
• One co-beneficiary signed

Greek does not always use an indefinite article exactly the same way English uses a/an, but ένας / μία / ένα often serves that role.

So compare:

• Ο συνδικαιούχος υπέγραψε. = The co-beneficiary signed.
• Ένας συνδικαιούχος υπέγραψε. = A co-beneficiary signed.