Compare lash back, pre-lash.
Prepositional phrase
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on the lash
- (UK, slang) Out drinking socially; usually involving heavy alcohol consumption.
- Synonyms: on the razz, on the razzle-dazzle
2011 January 9, Barbara Ellen, “Too many of us treat young white women as trash”, in The Observer[1]:There's endless coverage of drunken "ladettes" out on the lash, young girls being sick into gutters, lying in streets, smoking, getting pregnant, looking gormless, telling people with research clipboards that "all they wanna be is famous, innit".