しちゃう
sashidashichau

Godan Verb (su)
Godan Verb (u)

The completive aspect (contracted form) - indicates completion or regret of 差し出す

1. To hand over; To send out; To submit; To offer (and it's done); To have handed over; To have sent out; To have submitted; To have offered

Completed Action
Colloquial