Ichidan verb, 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
もうちょっと塩味をきかせてみたら?How about adding a little bit more salt? to use (tact, wit, etc.); to exercise; to display
see 気を利かせる
Also written 効かせる【きかせる】