(UK, slang, obsolete) To let fly; to attack or challenge someone.
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(transitive, idiomatic) To divulge a secret, as by accident or mistake.
It was let slip that they were planning to take over the business.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.