strengthen

v. make strong, fortify, reinforce, toughen; become strong

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Verb
1. make strong or stronger; "This exercise will strengthen your upper body"; "strenghten the relations between the two countries"
(synonym) beef up, fortify
(antonym) weaken
(hypernym) change, alter, modify
(hyponym) vitalize, vitalise
(derivation) strengthener, reinforcement
2. gain strength; "His body strengthened"
(antonym) weaken
(hypernym) change
(hyponym) consolidate
(derivation) strengthening
3. give a healthy elasticity to; "Let's tone our muscles"
(synonym) tone, tone up
(hypernym) exercise, work out

v. zesílit (se); posílit (se)

Czas. wzmacniać; wzmacniać się

(v. t.)
To make strong or stronger; to add strength to; as, to strengthen a limb, a bridge, an army; to strengthen an obligation; to strengthen authority.
  

(v. t.)
To animate; to encourage; to fix in resolution.
  

(v. i.)
To grow strong or stronger.