adverb
strongly; violently; with all one's strength
Describes doing something with sudden, forceful, or violent intensity. Often used with verbs of pulling, pushing, or striking.
彼はむずと相手の腕をつかんだ。
He grabbed the opponent's arm forcefully.
むずと引き寄せて抱きしめた。
She pulled him close and hugged him tightly.
The origin is uncertain. It may be related to the mimetic word むずむず (itching, impatient), but the exact derivation is unclear.