ichidan verb, transitive verb
grasp tightly; clench; grip firmly
Used for holding something firmly in one's hand, often with emotional intensity or determination.
彼女は手にハンカチを握りしめていた。
She was clutching a handkerchief tightly in her hand.
少年はこぶしを握りしめて悔しがった
The boy clenched his fists in frustration.