What is the meaning of Turn_in?

To submit something; to give.

To relinquish; give up; to tell on someone to the authorities (especially to turn someone in).

To go to bed; to retire to bed.

To convert a goal using a turning motion of the body.

To reverse the ends of threads and insert them back into the piece being woven so they do not protrude and eventually unravel.

Source: wiktionary.org