foul up

[foul up] {v.}, {informal} 1. To make dirty.

The birds fouled uphis newly washed car.

2. To tangle up.

He tried to throw a lassobut he got the rope all fouled up.

3. To ruin or spoil by stupidmistakes; botch.

He fouled the whole play up by forgetting hispart.

4. To make a mistake; to blunder.

Blue suit and brown socks!He had fouled up again.

5. To go wrong.

Why do some people foul upand become criminals?