身みが細ほそる

expression, godan verb (-ru)

lose weight; become thin

Often implies an undesirable or unhealthy loss of weight, such as from illness or worry. Used as a set phrase.

• 心しん配ぱい事ごとが続つづいて、彼かれはすっかり身みが細ほそってしまった。

  With constant worries, he has become quite thin.

• 病びょう気きで身みが細ほそる一いっ方ぽうだ。

  I keep losing weight because of illness.