らす
herasu

Godan Verb (su)

1. to abate; to decrease; to diminish; to shorten

Transitive
Antonym of 増やす
ジョギングでもして体重 たいじゅう らすようにしなさい。
jogingudemo shite taijūo herasu yōni shinasai.
Try to lose weight by jogging.