voluntary - uncharged (fee), offered, done willingly⏎
spec - specification, detailed description⏎
unscrupulous - dishonest, not fair, not honest, without morals,⏎
walkout - strike (by workers), fail in duty⏎
stable - steady, unchanging, firmly fixed⏎
slice - a share, portion, piece, part of something⏎
upsurge - sudden large increase⏎
venture - enterprise, speculate, undertaking, business project or activity⏎
skill - ability, competence, expertise, dexterity⏎