head down, bum up

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head down, bum up (uncountable)

  1. A figurative bodily position adopted when working hard at some task, either physical or mental. (Head down may well be literal, but bum up is figurative.)
    2007: Hadn't heard a thing. Hard at work, head down, bum up.Gold Coast Bulletin, Call of sea sirens, 6 April 2007 [1]