adverb
to one's heart's content; as much as one likes
Used when someone does something fully, without holding back, until completely satisfied. Often appears with verbs like 楽しむ, 話す, 泣く.
See also: 心ゆくばかり
休日は心ゆくまでゲームを楽しんだ。
On my day off, I enjoyed playing games to my heart's content.
彼女は心ゆくまで泣いたあと、すっきりした顔をしていた。
After crying as much as she wanted, she looked relieved.