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