Zginam kolano powoli.

Zginam means I bend or I am bending.

Its dictionary form is zginać, which is the imperfective verb to bend. In this sentence, zginam is:

• 1st person singular
• present tense
• so it literally means I bend / I am bending

Because Polish present-tense forms already show the person, you do not need a separate word for I.

Polish often leaves out subject pronouns when they are clear from the verb ending.

In zginam, the ending -am already tells you the subject is I. So:

• Zginam kolano powoli. = I bend my/the knee slowly.
• Ja zginam kolano powoli. also works, but ja adds emphasis, like I am bending the knee.

This is very normal in Polish.

Here kolano is the direct object of the verb zginam, so it is in the accusative case.

However, kolano is a neuter singular noun, and for many neuter nouns the nominative and accusative forms are the same. So:

• nominative: kolano
• accusative: kolano

That is why the form does not visibly change.

Polish very often omits possessive words like my, your, his, etc. when ownership is obvious from context, especially with body parts.

So:

• Zginam kolano powoli. naturally means I am bending my knee slowly
• even though moje is not stated

You can say Zginam moje kolano powoli, but that usually sounds more emphatic, contrastive, or less natural in an ordinary context.

Yes. Since Polish has no articles like a or the, and since possessives are often omitted when obvious, kolano can be understood in different ways depending on context:

• my knee
• the knee
• sometimes even just a knee, though that is less likely here

In normal real-life context, most learners would understand this sentence as I bend my knee slowly.

Powoli means slowly.

It is an adverb, so it describes how the action is done. In this sentence, it tells you the manner of bending:

• Zginam kolano powoli. = I bend my/the knee slowly.

A useful connection:

• powolny = slow (adjective)
• powoli = slowly (adverb)

Yes, Polish word order is fairly flexible.

The version Zginam kolano powoli is a neutral, natural order. But you can also move words around for emphasis:

• Powoli zginam kolano. = emphasis on slowly
• Kolano zginam powoli. = possible, but more marked or context-driven

Unlike English, Polish relies less on word order to show grammatical roles, because case endings do a lot of that work.

It describes an ongoing, repeated, or uncompleted action, because zginać is imperfective.

So zginam kolano powoli suggests something like:

• I am bending my knee slowly
• I bend my knee slowly

It does not focus on the action being completed. If you wanted a completed bend as a single finished action, Polish would normally use a perfective verb instead.

A rough pronunciation guide is:

• zginam ≈ ZGEE-nam
• kolano ≈ ko-LA-no
• powoli ≈ po-VO-li

A slightly more accurate breakdown:

• zginam: the zg cluster is pronounced together, and the gi is soft
• kolano: stress on la
• powoli: stress on vo

Like most Polish words, the stress falls on the second-to-last syllable:

• zginam
• kolano
• powoli

Yes, it is grammatically natural. It sounds like something you might hear in:

• exercise instructions
• physiotherapy
• medical contexts
• movement descriptions

In everyday conversation, a Polish speaker might also say similar things like:

• Powoli zginam nogę. = I slowly bend my leg
• Zegnij kolano powoli. = Bend your knee slowly (command)

So the sentence is completely fine and natural, especially in a physical-action context.