1. (noun)
parturiency, labor, labour, confinement, lying-in, travail, childbed
concluding state of pregnancy; from the onset of contractions to the birth of a child
"she was in labor for six hours"
2. (noun)
effort, elbow grease, exertion, travail, sweat
use of physical or mental energy; hard work
"he got an A for effort"; "they managed only with great exertion"
3. (verb)
labor, labour, toil, fag, travail, grind, drudge, dig, moil
work hard
"She was digging away at her math homework"; "Lexicographers drudge all day long"
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