This is the 13344th most frequent Turkish word.
kiminle
"With whom."
The word 'kiminle' here is used as an interrogative pronoun combined with a prepositional suffix, forming 'with whom' to ask about the companion of the action.
Kiminle dışarı çıkıyorsun?
With whom are you going out?
In this sentence, 'kiminle' is used in an indirect construction to reflect questioning the identity of the interlocutor in the action.
Kiminle konuştuğunu bilmiyorum.
I don't know with whom you talked.
Here, 'kiminle' queries about a third party involved in the action of introduction.