虫むしが付つく

expression, godan verb (-ku)

become infested with insects; get worms

Literal sense: insects or worms appear on or in something, such as food, plants, or animals.

• 古ふるい米こめに虫むしが付ついた。

  The old rice became infested with insects.

expression, godan verb (-ku)

fall in with bad company; get a bad lover

Figurative use: a person (especially a woman) gets involved with an undesirable partner or group. Often used in the negative or as a warning.

• あの娘こは虫むしが付つく前まえに注ちゅう意いしたほうがいい。

  You should warn that girl before she falls in with bad company.

• 彼かの女じょに虫むしが付ついたらしい。

  It seems she's gotten involved with a bad guy.