запнуться означает в английский

hesitate [hesitated, hesitating, hesitates]▼(to stammer; to falter in speaking)
verb
[UK: ˈhe.zɪ.teɪt] [US: ˈhe.zə.ˌtet]

trip [tripped, tripping, trips]▼(fall over or stumble over an object)
verb
[UK: trɪp] [US: ˈtrɪp]