good right arm (noun) mainstay: chief support
Sinonime: break, break in,
condition,
cultivate,
develop,
discipline, drill, dry run,
exert,
fix,
foster, groom, habituate, hone,
improve, inure,
labor, lick into shape, limber up, loosen up,
maneuver, ply, practice, prepare, pump iron, put out, put through grind, put through mill, rehearse, run through,
set,
strain, teach, train, tune up, walk through, warm up,
work, work out