noun British Informal.
a party or lively gathering, usually including dancing.

by ellipsis from Knees up, Mother Brown a popular dance, originally a song with the same title (1939) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To kneesup
World English Dictionary
n , pl knees-ups
1.  a boisterous dance involving the raising of alternate knees
2.  a lively noisy party or celebration, esp one with dancing
[C20: from the song "Knees up Mother Brown" to which the dance is performed]

Collins English Dictionary - Complete & Unabridged 10th Edition
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