つまずいちゃう
躓いちゃう
tsumazuichau

Godan Verb (ku)
Godan Verb (u)

The completive aspect (contracted form) - indicates completion or regret of つまずく

1. Stumble; Trip; Flounder; ; (with implication of unexpectedness or regret)

Completed Action
Colloquial
Usually Written in Kana