Tafadhali weka siri hii.

Tafadhali means please. It makes the command more polite.

So:

• Weka siri hii. = Keep this secret.
• Tafadhali weka siri hii. = Please keep this secret.

It is not grammatically required, but it is very common when you want to sound courteous.

Yes, weka often means put, place, or set. But like many verbs, it can also be used in broader, idiomatic ways.

In weka siri hii, the idea is something like:

• put this in secrecy
• therefore: keep this secret

So even though the basic meaning of weka is put/place, in context it can mean keep.

Yes. Weka is the imperative form, meaning it is used to give a command or instruction.

So weka means:

• put!
• keep!

In this sentence, it is telling someone to do something: Keep this secret.

In Swahili, commands often do not include an explicit subject pronoun.

English usually says:

• You, keep this secret
• or just Keep this secret

Swahili normally does the same kind of thing and simply uses the imperative:

• Weka siri hii.

The you is understood from the command form.

Siri means secret.

It can refer to:

• a secret piece of information
• secrecy/confidentiality in a broader sense, depending on context

In this sentence, siri hii means this secret.

In Swahili, the usual order is:

• noun + demonstrative

So:

• siri hii = this secret
• literally: secret this

That is normal Swahili word order. English does the opposite:

• this secret

Hii means this.

Swahili demonstratives agree with the noun class of the noun they describe. Siri belongs to a noun class that takes hii in the singular.

So:

• siri hii = this secret

Learners often notice that English uses one word, this, for everything, but Swahili changes the form depending on the noun class.

The sentence follows this order:

• Tafadhali = please
• weka = keep / put
• siri hii = this secret

So the structure is basically:

• Please + verb + object

That makes Tafadhali weka siri hii a very natural Swahili sentence.

On its own, weka can literally mean put/place, so a very literal reading is possible in some contexts. But with siri the natural meaning is usually keep this secret.

So in normal usage, a learner should understand:

• weka siri hii = keep this secret

rather than a physical action involving a secret.

If you are addressing more than one person, the imperative is commonly changed to the plural form:

• Tafadhali wekeni siri hii.

Here:

• weka = singular command
• wekeni = plural command

So:

• Tafadhali weka siri hii. = Please keep this secret. (to one person)
• Tafadhali wekeni siri hii. = Please keep this secret. (to more than one person)

Yes, the double i matters. Hii is pronounced with a longer ee-like sound than a single i.

A rough guide:

• hii ≈ hee-ee said smoothly

Swahili spelling is fairly regular, so double vowels are usually pronounced clearly rather than ignored.

By itself, an imperative can sound direct, just like in English:

• Weka siri hii. = Keep this secret.

Adding tafadhali softens it and makes it polite:

• Tafadhali weka siri hii. = Please keep this secret.

So the sentence can be perfectly polite, especially because it includes tafadhali.