How to say: "screwed it up" How can I express that someone "screwed [something] up?"  For example:

"They really screwed up the code with the last changes they made"

"I gave him one little task and he still managed to screw it up"

"I can't believe I screwed that up."

I would like it to not be vulgar, and as in the English, it is a casual/informal expression that might be used between colleagues or friends.
&quot;Screw up&quot; is a slang for &quot;to blunder&quot;
搞砸 /gǎo zá/ : blunder
弄糟 /nòng zāo/ : blunder ; mess up

How can I express that someone &quot;screwed [something] up?&quot;

他把事情搞砸了
他把事情弄糟了

砸
: break; smash; shatter
: [slang] fail; fall through; flop