1
to work on (someone);to appeal to;to make approaches to;to pressure;to exert influence on;to seek action from
彼の気持ちを変えさせるよう、彼に働きかけねばならない。
He must be worked upon so that his feeling may be made to change.
2
to begin to work
Other forms
働き掛ける 【はたらきかける】