This is the 15060th most frequent Russian word.
позвони
"Позвони" means "call" or "give a call" (imperative form).
Here, 'позвони' is used as an imperative command to request a call.
Позвони мне завтра, чтобы обсудить детали.
Call me tomorrow to discuss the details.
In this sentence, 'позвони' is used in a conditional context to suggest calling under certain circumstances.
Если у тебя будут вопросы, позвони мне.
If you have any questions, call me.
The word 'позвони' is used as reported speech, conveying a command to another person.