The phrase "catch one's foot" refers to tripping or stumbling due to getting one's foot caught on an obstacle. Synonyms for this phrase include stumbling, tripping, stumbling over, tripping over, slipping, losing footing, losing balance, falling, taking a tumble, and hitting the deck. All of these phrases refer to some sort of mishap while walking or running, often resulting in a fall or stumble. It is important to be cautious and aware of one's surroundings to avoid catching one's foot or any other potential hazards that could lead to injury.