Shinikizo limeongezeka.

It can be broken down like this:

• li- = subject marker for the noun class of shinikizo
• -me- = perfect marker, often giving the sense of has
• -ongezeka = increase / become greater

So limeongezeka literally works like it has increased.

Because Swahili verbs usually agree with the subject noun.

Shinikizo belongs to noun class 5 in the singular, and the subject marker for that class is li-. So the verb must match it:

• Shinikizo limeongezeka = the pressure has increased

If the noun were plural, the agreement would change:

• Mashinikizo yameongezeka = the pressures have increased

So li- is there because the verb is agreeing with shinikizo.

-me- is a very common Swahili tense/aspect marker. In many contexts, it corresponds to English has/have or a completed action with present relevance.

So:

• limeongezeka = has increased
• not just increased in a simple past sense

Compare:

• liliongezeka = it increased
• limeongezeka = it has increased

In everyday translation, English may vary a bit depending on context, but -me- usually gives that has/have feeling.

Because Swahili usually builds that meaning into the verb itself.

In English, you need separate pieces:

• has increased

In Swahili, that information is packed into one word:

• li-me-ongezeka

This is very normal in Swahili. A single verb form often includes:

• who or what is doing it
• tense/aspect
• the verb meaning itself

This is an important distinction:

• kuongezeka = to increase, to go up, to become greater
  
  • usually intransitive
• kuongeza = to increase something, to add
  
  • usually transitive

So in your sentence:

• Shinikizo limeongezeka = the pressure increased / has increased

But if someone causes an increase, you would use kuongeza:

• Wameongeza shinikizo = they have increased the pressure

So -ongezeka is the right choice when the subject itself is what's changing.

Swahili does not have articles like English a, an, and the.

So shinikizo can mean:

• pressure
• the pressure

Which English version sounds best depends on context.

That is why Shinikizo limeongezeka can be translated naturally as either:

• Pressure has increased
• The pressure has increased

Shinikizo is singular and takes class 5 agreement, which is why the verb uses li-.

Its plural is:

• mashinikizo

Then the verb agreement changes to ya- for class 6:

• Mashinikizo yameongezeka

This is one reason noun classes matter so much in Swahili: they affect verbs, adjectives, demonstratives, and more.

A rough guide:

• Shinikizo = shi-ni-KI-zo
• limeongezeka = li-me-o-nge-ZE-ka

A few useful points:

• sh sounds like sh in shoe
• ng in ongezeka is pronounced as a real ng sound, like in finger
• Swahili stress usually falls on the second-to-last syllable

So the main stresses are:

• shiniKIzo
• limeongeZEka

Swahili spelling is also quite regular, so once you know the sound system, pronunciation is usually straightforward.

Yes. Depending on context, natural English translations could include:

• The pressure has increased
• Pressure has increased
• The pressure is higher
• Pressure has gone up

The Swahili sentence itself is straightforward, but English may choose slightly different wording depending on whether the context is medical, mechanical, emotional, political, and so on.

A common negative form is:

• Shinikizo halijaongezeka = the pressure has not increased

Here, the negative verb form changes, but it still agrees with shinikizo.

So you can compare:

• Shinikizo limeongezeka = the pressure has increased
• Shinikizo halijaongezeka = the pressure has not increased

This is a useful pair to learn together.