Correct
开怀
/ kāihuái /
Strokes
Definition
to one's heart's content/without restraint
Example
As a Verb
(do) to one's heart's content
1
Kāihuáichàngyǐn
开怀畅饮
drink to one's heart's content
2
Kāihuáichàngtán
开怀畅谈
have a hearty talk together
3
Kāihuáidàxiào
开怀大笑
have a hearty laugh; laugh heartily