buckle down

Verb

1.

buckle down - work very hard, like a slave Synonyms: break one's back, knuckle down, slave

be determined, be in earnest, be resolved, buckle to, cross the Rubicon, die fighting, die hard, endeavor, go all out, go for broke, hump, hump it, knuckle down, lay to, mean business, never say die, ply the oar, spare no effort, take the plunge