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")
Overview of verb travail
The verb travail has 1 sense
labor, labour, toil, fag, travail, grind, drudge, dig, moil -- (work hard; "She was digging away at her math homework"; "Lexicographers drudge all day long")