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Phrase(s): dump one’s load
1. Sl. to empty one’s stomach; to vomit. • He’s had too much to drink and is dumping his load. 2. and dump a load Sl. to defecate. (Crude. Potentially offensive. Use only with discretion.) • He had to go dump a load. • He dumped his load and settled back down to work.
McGrawhill's American Idioms And Phrasal Verbs