Search Result for "knuckle_down":
Wordnet 3.0

VERB (1)

1. work very hard, like a slave;
[syn: slave, break one's back, buckle down, knuckle down]



WordNet (r) 3.0 (2006):

knuckle down
    v 1: work very hard, like a slave [syn: slave, break one's
         back, buckle down, knuckle down]