onomatopoeic adverb expressing a deep stab or thrust; used for something physically piercing or figuratively for words that hit hard.
針が指にグサッと刺さって血が出た。
A needle stabbed into my finger and it bled.
彼の一言が胸にグサッと刺さった。
His remark really stabbed me in the chest (hit me hard emotionally).
矢が的にグサッと刺さった音がした。
There was a sound as the arrow struck the target.