Wiktionary
vb. (present participle of hand in English)
Usage examples of "handing in".
She started when the first hands grabbed her sleeves, then closed her eyes and remained still while hands tore at her gown, shredded it, ripped it from her body until all that remained was the net handing in a straight line from her head.
Wendy may be a doctor and everything, but in her head she's still handing in essays and getting A's.
Feeling like a traitor, Charlie scribbled his signature on the bottom of the second page before handing in his report to the orderly officer.
The fake X now leaves by the main gate, handing in his tag and forging the name.
If you bother me any more, ratface, you'll be handing in your toga way ahead of schedule.
I'll be first-handing in Marc's box, and my prayers will be with you and Shanna.