knees-up

The phrase comes from the song "Knees Up Mother Brown," which was associated with the pubs of London's East End in the 20th century. Primarily heard in UK.

1. A lively dance in which participants raise alternate knees. Come on, get on the dance floor and do the knees-up with us!

2. A party, especially one marked by spirited dancing. I'm going to have a knees-up this weekend so we can celebrate finally finishing that big project! I'm so exhausted—Josh had a knees-up last night, and I didn't get home till late.

See also:

have a knees-up
prop up the bar
blinder
take (one) out at the knees
up to (one's) knees
up to knees
up to one's knees
on (one's) hands and knees
on your hands and knees
down on (one's) hands and knees

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