mucksweat

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“Publican Black Ned Bratts and Tabby his big wife too: Both in a muck-sweat.”

— Robert Browning · 'Dramatic idyls' (1879)

muck sweat, n. Now colloquial. A profuse sweat; (figurative) a panic, a frantic state of mind. Chiefly in in (also into) a muck sweat.