This is the 14310th most frequent Russian word.
отдайте
"Give back" or "return."
The word "отдайте" in this context is a polite request to give something to the speaker.
Отдайте мне, пожалуйста, эту книгу.
Please hand me that book.
Here, "отдайте" is used to request someone to give the found item of the speaker to another party.
Если найдёте мой телефон, отдайте его в полицию.
If you find my phone, please return it to the police.
In this example, "отдайте" indicates an instruction to transfer an item from one person to another as part of a process or task.