がくんと

Meanings

Describes a sudden, sharp movement or change, often implying a jolt or abrupt drop. Common with verbs like 落ちる, 下がる, 止まる.

〈物もの〉ががくんと止とまるfor something to come to a sudden, jerking stop
バスが急きゅうブレーキでがくんと止とまった。
The bus came to a sudden jerking stop with the emergency brake.
〈数すう〉ががくんと下さがるfor a number or level to drop sharply
今こん月げつの売うり上あげががくんと下さがった。
This month's sales dropped sharply.
体からだががくんと揺ゆれるfor one's body to jerk suddenly (from an impact or jolt)
電でん車しゃが急きゅう停てい車しゃして、体からだががくんと揺ゆれた。
The train stopped suddenly and my body jerked forward.