Akademik

stumble

1. noun

a) a fall, trip or substantial misstep

b) an error or blunder

Syn: blooper, blunder, boo-boo, defect, error, fault, faux pas, fluff, gaffe, lapse, mistake, slip, thinko

2. verb

a) to trip or fall

He stumbled over a rock.

b) to make a mistake or have trouble

I always stumble over verbs in Spanish.

Wikipedia foundation.