Senses
开心/ 開心 happy
To feel happy; to rejoice; to have a great time.
开心/ 開心 to make fun of
To make fun of someone; to tease someone for one's own amusement.
开心/ 開心 to be sincere
To be sincere or honest with others; to show one's heart.
开心/ 開心 to enlighten
(literary) To enlighten or broaden the mind.
开心/ 開心 open-heart surgery
(Taiwan, colloquial) to perform or undergo open-heart surgery