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мартышкин труд stresses
gen.	fungo; food for squirrels; carrying coals to Newcastle (Anglophile); cutting blocks with a razor (Anglophile); waste of time (slitely_mad); useless activity (slitely_mad); monkey job (maximrrrr)
Gruzovik, inf.	lost labor; useless effort; wild goose chase
idiom.	Sisyphean task (o_lia)
inf.	lost labour; exercise in futility (Халеев); hopeless undertaking (Ремедиос_П)
relig.	fool's errand
"мартышкин труд"
gen.	monkey business

мартышкин труд: 3 phrases in 2 subjects

Idiomatic	2
Proverb	1