Foul up and Fall down

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

Fall down and foul up are semantically related In some cases you can use "Fall down" instead a verb "Foul up".

Fall down verb - Lose an upright position suddenly.

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