also: がっしと
adverb, noun or participle which takes 'suru'
Onomatopoeic adverb describing a strong, solid, or hearty manner of doing something, often with a sense of force or vigor. Can be used with する to mean 'to do firmly' or 'to grip tightly'.
See also: がっしり
彼は私の手をガシッと握った。
He firmly grasped my hand.
その選手はボールをガシッとキャッチした。
The player solidly caught the ball.