Stumble
Part of speech: noun
Definition: a fall or trip an error or blunder
Part of speech: verb
Definition: to trip or fall to make a mistake or have trouble
Example sentence: Our incomes are like our shoes; if too small, they gall and pinch us; but if too large, they cause us to stumble and to trip.
Lurch
Part of speech: noun
Definition: A sudden or unsteady movement.
Part of speech: verb
Definition: To make such a sudden, unsteady movement.