Godan verb with 'su' ending, Transitive verb
to bring out (the effect of); to put to good use; to make use of (e.g. threats); to use (e.g. intimidation); to take advantage of (e.g. one's influence); to season (with salt, etc.); to put in
see 利かせる
彼は小節を利かして歌っています。He is singing with a lot of ornamentation. to use (tact, wit, etc.); to exercise; to display
see 気を利かす
Also written 効かす【きかす】