KanjiJLPT N2
Refrain

withdraw, draw in, hold back, refrain from, be moderate

Mnemonic

Your hand stretches toward the forbidden fruit. Every fiber screams to grab it, but you refrain. You pull your hand back empty—fingers trembling, unclenched. Keeping that hand empty is the hardest act of restraint you have ever managed.
Additional thoughts
Visualize a shaking open palm pulled back from temptation. An empty hand is proof you held back. The emptiness IS the refrain.
Quick recall
You pull your hand back empty, choosing to refrain.

Details

The keyword for 控 is refrain. This kanji conveys the idea of holding back, restraining oneself, or waiting in reserve. It carries the sense of exercising self-control by deliberately not doing something, or of keeping something in check. It can also refer to waiting on standby or making a note of something for future reference, reflecting the broader theme of measured restraint and careful reserve.
On'yomi
こう
Kun'yomi
ひか.える、ひか.え