ろしちゃう
nadeoroshichau

Godan Verb (su)
Godan Verb (u)

The completive aspect (contracted form) - indicates completion or regret of 撫で下ろす

1. Stroking down (and finishing); Stroking down (with a feeling of completion/relief); Stroking down (with a hint of regret/sadness)

Completed Action
Colloquial