けちゃう
kagiwakechau

Ichidan Verb
Godan Verb (u)

The completive aspect (contracted form) - indicates completion or regret of 嗅ぎ分ける

1. To distinguish/tell apart (and then stop); To smell/sense (and then stop); To figure out (and then stop); To discern (and then stop)

Completed Action
Colloquial