つまず躓tsumazuくkuつまづ躓tsumazuくku
1.
To lose one's balance while walking due to an obstruction, often causing a momentary disruption in movement or posture.
2.
To encounter an obstacle or unforeseen issue during an endeavor, leading to an interruption or failure in progress.
Example:
私は石につまずいて、足首をひねってしまった。