Flub and Fall down

Flub verb - To make or do (something) in a clumsy or unskillful way.

Fall down and flub are semantically related In some cases you can use "Fall down" instead a verb "Flub".

Fall down verb - Lose an upright position suddenly.

Flub and fall down are semantically related in blunder topic. Sometimes you can use "Flub" instead a verb "Fall down", if it concerns topics such as botch.