しめ わせちゃう
shimeshiawasechau

Ichidan Verb
Godan Verb (u)

The completive aspect (contracted form) - indicates completion or regret of 示し合わせる

1. To show (someone) and then…; To reveal and then…; To let (someone) see and then…; To demonstrate and then…; (Implies subsequent consequence, often negative or regretful)

Completed Action
Colloquial