Опара поднялась за ночь.

Опара is a baking term. It means a sponge, preferment, or a pre-fermented dough mixture made with flour, liquid, and yeast before the final dough is mixed.

It is a feminine noun, which matters for the verb form in this sentence.

Because the subject опара is:

• singular
• feminine
• in the past tense

In Russian past tense, the verb agrees with the subject in gender and number:

• masculine: поднялся
• feminine: поднялась
• neuter: поднялось
• plural: поднялись

So with опара, you get поднялась.

Because поднялась comes from the reflexive verb подняться, which means to rise, to go up, to rise up by itself.

Compare:

• поднять = to raise / lift something
• подняться = to rise / get up / go up

So:

• Она подняла тесто = She raised/lifted the dough
• Опара поднялась = The sponge rose

In this sentence, the dough is not raising something else; it is rising itself, so Russian uses the reflexive verb.

The ending -ся often makes a verb reflexive or gives it a middle/intransitive meaning.

Here it does not mean that the sponge is literally doing something to itself in a conscious way. Instead, it shows that the action happens to the subject itself:

• поднять = to lift something
• подняться = to rise

So -ся is a key part of making the meaning rise rather than raise.

Поднялась is perfective, and that fits because the sentence presents the action as a completed result.

The idea is that by the end of the night, the sponge had already risen.

Compare:

• Опара поднялась за ночь = the sponge rose / had risen overnight
  → focus on the result
• Опара поднималась всю ночь = the sponge was rising all night
  → focus on the process

Russian often uses the perfective when talking about something that happened successfully within a certain time span.

За ночь means overnight or in the course of the night.

Here за + accusative is used to show that something happened within a period of time.

So:

• за час = in an hour
• за день = in a day
• за ночь = overnight / in the night / during the night, with emphasis on completion within that span

In this sentence, it means the sponge managed to rise during the night.

Because the preposition за can take different cases with different meanings.

Here it takes the accusative to mean within a time period.

The noun ночь is feminine, and its accusative singular form is also ночь, so the form does not visibly change.

This use is very common:

• Я сделал это за час = I did it in an hour
• Он прочитал книгу за два дня = He read the book in two days
• Опара поднялась за ночь = The sponge rose overnight

Yes, but the meaning shifts slightly.

• ночью = at night / during the night
• за ночь = overnight / within the night, with a result achieved by the end

So:

• Опара поднялась ночью focuses more on when it happened
• Опара поднялась за ночь focuses more on the fact that it happened over the course of the night

In many contexts both are possible, but за ночь is especially natural when the important idea is that the sponge was ready by morning.

Russian has no articles.

So опара can mean:

• a sponge
• the sponge

Which one is intended depends on context. In a recipe or kitchen situation, it will often be understood naturally as the sponge.

Yes. Russian word order is quite flexible.

The basic order here is:

• Опара поднялась за ночь.

But you could also say:

• За ночь опара поднялась.

Both are grammatical. The difference is mainly in emphasis:

• Опара поднялась за ночь = neutral statement
• За ночь опара поднялась = stronger emphasis on overnight

Russian uses word order partly to manage focus and emphasis, not just grammar.

A helpful stress pattern is:

• опАра
• поднялАсь
• за ночь

So the whole sentence is pronounced approximately:

опАра поднялАсь за ночь

A few notes:

• о in unstressed position is reduced in pronunciation
• ь in ночь is a soft sign; it does not make a separate sound
• -лась in поднялась is pronounced together as part of the verb ending

Sometimes yes, depending on the exact nuance.

For dough or sponge, Russian often uses verbs like:

• подняться = to rise
• подойти = to proof / rise and become ready

For example:

• Опара подошла is also very natural in baking language and can mean that the sponge has risen and is ready.

But поднялась is a very straightforward and common way to say that it rose physically.

Подняться is a very common general verb. It can mean many kinds of rising:

• солнце поднялось = the sun rose
• цены поднялись = prices went up
• он поднялся по лестнице = he went up the stairs
• тесто поднялось = the dough rose

So in this sentence it is a normal general verb being used in a baking context.