Example: His voice is breaking--he should no longer sing in the choir.
source: wordnet30
fall sharply(verb.change)
source: wordnet30
fracture a bone of(verb.body)
source: wordnet30
diminish or discontinue abruptly(verb.body)
source: wordnet30
weaken or destroy in spirit or body(verb.body)
source: wordnet30
To strain apart; to sever by fracture; to divide with violence; as, to break a rope or chain; to break a seal; to break an axle; to break rocks or coal; to break a lock.(verb)
source: webster1913
To come apart or divide into two or more pieces, usually with suddenness and violence; to part; to burst asunder.(verb)