louse up

Idioms and Phrases

Spoil, ruin, bungle. For example, The bad weather loused up our plans , or Your change of mind really loused me up . This slangy expression originated in World War I, when infestation with lice was the common lot of soldiers in the trenches; its figurative use dates from the 1930s.

Example Sentences

She'd be shocked to her sweet little core, and she'd louse up the whole deal.

From Project Gutenberg

All you did was louse up a perfectly promising fracas so far as they were concerned.

From Project Gutenberg

There's always stuff in the way to louse up a good flight plan.

From Project Gutenberg