カッとなる

かっとなる

expression

to lose one's temper, to flare up, to get hot-headed

informalspokenemotion

1. to lose one's temper, to flare up suddenly

To suddenly become angry and lose control of one's emotions. The mimetic カッと represents the sudden flash of anger.

カッとなって怒鳴(どな)った。

I lost my temper and yelled.

カッとなりやすい性格(せいかく)だ。

I have a short temper.

カッとなって殴(なぐ)ってしまった。

I got so angry I ended up hitting them.

Don't lose your temper—let's talk calmly.

カッとなる uses the mimetic カッと to express the sudden, intense nature of the anger—like a flash of heat.

カッと by itself can describe:

Often used when explaining why someone did something regrettable in a moment of anger.

general

Added 2026.2.1 20:12 · Revised 2026.9.2 13:01

09000/09423_kattonaru