turn in

1 to give (something) over to the control or possession of another usually under duress turned in the banned assault rifle to the police Synonyms cede, cough up, deliver, give up, hand over, lay down, relinquish, render, surrender, turn over, yieldRelated Words commit, consign, entrust (also intrust), transfer; forfeit, release, waive; abnegate, renounce, resign; abandon, desert, discard, forsake, part (with), shedNear Antonyms keep, retain, withhold

2 to go to one's bed in order to sleep it's almost midnight, so it's time to turn in Synonyms crash [slang], doss (down) [chiefly British], retire, bedRelated Words bunk, perch, roost, settle; doze, drop off, nap, nod, sleep, slumber, snooze; couch, lie (down), reclineNear Antonyms arouse, awake, awaken, rouse, wake, waken; bestir, stir; reawake, reawaken; shift, stirAntonyms arise, get up, rise, uprise