Knees up:
A lively party or dance.
Vocabulary meanings from the English-Bulgarian dictionary:
Knee [ni:] – knee.
Up [ʌp] – up, higher, above.
Examples:
On the night their exam results came out, they went down to the pub for a right old knees up.
We had a bit of a knees-up last night.
The expression originates from the song 'Knees Up Mother Brown' from the 1930s.
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