trzymać

In a sentence

• Trzymam książkę w rękach.

  I am holding a book in my hands.

  Here, 'trzymać' refers to physically holding something in one’s hands.

• Musimy trzymać się planu.

  We must stick to the plan.

  In this case, 'trzymać' is used idiomatically to mean adhering to something.

• Trzymam twoje sekrety w tajemnicy.

  I keep your secrets a secret.

  Here, 'trzymać' means to maintain or keep something in a certain state, like holding information confidential.