にぎらせっちゃう
nigirasecchau

Ichidan Verb
Godan Verb (u)

The completive aspect (contracted form) - indicates completion or regret of 握らせる

1. Let me have you hold it.; I'll make you hold it.; (Implies forcing/making someone hold something, with a nuance of regret or apology.)

Completed Action
Colloquial