birbirine

In a sentence

• İki arkadaş birbirine yardım etti.

  Two friends helped each other.

  Here, 'birbirine' means 'each other,' denoting mutual assistance between the two friends.

• Hepsi birbirine çok benziyor.

  All of them look very similar to each other.

  In this sentence, 'birbirine' signifies mutual similarity among multiple items or individuals.

• Komşular birbirine selam verdi.

  The neighbors greeted each other.

  Here, 'birbirine' is used to indicate reciprocal action (greeting) between two neighboring parties.