くっ

Ugh!, damn!

interjection Rare #36,268
Ugh!, damn! A short, often dramatic grunt of pain, frustration, or effort.
JA: くっ、もう少しだったのに。
EN: Ugh, I was so close.

くっ!

Damn!

— Pompo the Cinephile (2021)

くっ

Tch...

— AKIRA (1988)

くっ…

Ngh...

— AKIRA (1988)

くっ!

Argh!

— Pompo the Cinephile (2021)

ついに、彼は私の説得くっした。

Finally, he gave in to my persuasion.