transitive verb
1.
a. : to deliver up : hand over
turn in an expense account
turned in his badge and quit
b. : to inform on : betray
turn in a wanted man to police
c. : to give an account of oneself respecting : acquit oneself of
turns in a fine performance as the hero's father
turned in a piece of good reporting — Ellen Smith
2. : to turn under
turn in a fodder crop as green manure
intransitive verb
1. : to turn from a road or path so as to enter
their neighbors were turning in at their own gate — Dorothy C. Fisher
2. : to go to bed
must have known how late he had turned in — Edward Newhouse
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- turn in upon oneself