Meaning of knee up

[Crocodile Babyc]

English Language Tests, Intermediate level

ESL/EFL Test #103 "Charlie's Knees", question 7

They met at a mutual friend's party where everyone was having a great time in a kind of knees ..........

(a) under
(b) on
(c) in
(d) up

English Language Tests, Intermediate level

ESL/EFL Test #103 "Charlie's Knees", answer 7

They met at a mutual friend's party where everyone was having a great time in a kind of knees up.

Correct answer: (d) up

Your answer was: incorrect
They met at a mutual friend's party where everyone was having a great time in a kind of knees under.
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Please tell me what is the meaning of knee up. Thanks in advance! ^__^

Crocodile Baby

[Mister Micawber]

.
To be honest, 'knees up' means nothing to me, either. It is a purely British idiom. The Oxford says:

knees-up

• noun Brit. informal a lively party.
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Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mister Micawber

[Alan]

Hi Crocodile Babyc,

This expression refers to an occasion when everyone enjoys themselves often in the form of a celebration. As it suggests, knees go up and down because people are dancing in a very animated way.

Alan
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English as a Second Language
You can read my ESL story Phrasal Verbs/take