to make mistakes; do or be wrong

make a mistake; do wrong

for certain, no matter what difficulties etc there may be

be unsuccessful

(of a personal possession, a pet etc) to be lost (with the belief that it will be found quickly)

act in inappropriate manner

(especially of children) to behave badly or improperly

act in inappropriate manner

to calculate (amounts etc) wrongly

make a mistake

(of a gun) to fail to send a bullet

fail