Knuckle Down
[v] work very hard, like a slave
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accede, accept, acquiesce, assent, be agreeable, buckle down, comply, consent, endeavor, face the music, go all out, go along with, hump, hump it, knock under, knuckle under, lay to, live with it, not resist, obey, ply the oar, relent, resign, spare no ef