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What is up to the mark?
To be at the apogee of the sexual act; to be fully inserted into one's partner. Said to be from the data plate found on the sides of various pieces of hydraulic drilling equipment. To be up to your nuts in guts, to bottom out.
Chuck was up to the maker's mark in Cindy last night - that must explain why she's walking funny today. - Sol R.
up to the mark - video
Up to the mark - what is it?
Her latest batch of work just isn't up to the mark.