Definition of STRENGTHEN

to increase the ability of (as a muscle) to exert physical force <lifting weights every day will eventually strengthen your muscles> <the army makes new recruits run for miles in order to strengthen them>
Synonyms beef (up), fortify, harden, toughen
to make able to withstand physical hardship, strain, or exposure <required weeks of physical therapy to strengthen his arm enough to pitch for the team again>
Antonyms soften
to make markedly greater in measure or degree <encouraged the boarding school students to strengthen their ties with the community by doing public service>
Antonyms abate, moderate
to prepare (oneself) mentally or emotionally <strengthened herself for the moment she'd have to tell her friend that she had lost the borrowed necklace>
to make more harsh, uncompromising, or severe <a bill was introduced to strengthen punishments for hate crimes>
Near Antonyms lessen, moderate, soften
Antonyms ameliorate, ease

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