마음을 먹어요 · 마음먹었어요 · V-기로 마음먹다
to make up one's mind, to decide, to resolve
Example
올해는 꼭 담배를 끊기로 마음을 먹었어요.
I've made up my mind to quit smoking this year.
Word parts
먹다 here means 'to take on' a feeling or resolve, as in 겁을 먹다 'to get scared.'
Good to know
Usually V-기로 마음(을) 먹다, and it's often written as one word, 마음먹다.
Related words