strengthen (verb) strengthen: make more forceful, powerful
Sinonime: add, add fuel to fire, anneal,
ascend,
bolster,
brace,
build up,
buttress,
confirm,
corroborate,
empower,
enhance,
enlarge,
establish,
extend,
fortify, harden,
heighten,
increase,
intensify,
invigorate,
justify, make firm,
mount,
multiply,
regenerate,
reinforce,
rejuvenate,
renew,
restore,
rise,
set up, sinew,
steel, step up,
substantiate,
support,
sustain,
temper,
tone, tone up, toughen, wax
Antonime: break down,
hurt,
weaken