"Knees-up" now refers to a lively party in England, often a dance party. The term comes from this song by Harris Weston and Bert Lee written in 1939. It's not as popular as a term now... yet the song is still sung in pubs in England, especially the second version below.

Notes

Common Modern Lyrics in the UK:

Knees up Mother Brown!
Knees up Mother Brown!
Under the table you must go
E-I-E-I-E-I-O!
If I catch you bending,
I'll saw your legs right off*,
Knees up! Knees Up!
Don't get the breeze up,
Knees up Mother Brown!

Oh My! What a rotten song!
What a rotten song!
Oh, What a rotten song!
Oh My! What a rotten song!
What a rotten singer too!

Knees up Mother Brown!
Knees up Mother Brown!
Under the table you must go
E-I-E-I-E-I-O!
If I catch you bending,
I'll saw your legs right off,
Knees up! Knees Up!
Don't get the breeze up,
Knees - up - Mother - Brown!
Ow's yer farver**? All right!

*Or "We'll turn you upside-down".
**Literally, "How's your father?" It was a catch phrase in the music halls in Britain and then during WWII. It has a certain innuendo.

Watch
In the video below you can see the type of dancing the song refers to...
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Here's one in a British pub…
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