A sharp point or pointed end.
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(figuratively) An important moment when a decision is made that will determine future events.
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(geometry) A point of a curve where the curve is continuous but has no derivative, but such that it has a derivative at every nearby point.
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Add your own interpretation of "cusp".
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.