1.
Hand in, give over, as in I turned in my exam and left the room. [c. 1300]
2.
Surrender or inform on, especially to the police, as in The shoplifter turned herself in. [1920s]
3.
Produce, as in He turned in a consistent performance every day. [Mid-1900s]
4.
Go to bed, as in I turned in early last night. [Colloquial; late 1600s]




