An adverb expressing a sudden, forceful action (a quick yank, shove, or jerk).
彼はロープをぐいっと引いた。
He gave the rope a sudden yank.
ドアをぐいっと押して開けた。
She shoved the door open.
先生が腕をぐいっとつかんで歩かせた。
The teacher grabbed his arm and pulled him along forcefully.
An adverb for drinking or swallowing something in one go (a single gulp).
彼はビールをぐいっと飲み干した。
He downed his beer in one gulp.
朝のコーヒーをぐいっと飲んでから出かけた。
I gulped down my morning coffee before leaving.
緊張していたが、勇気を出してぐいっと一口飲んだ。
I was nervous, but I mustered courage and took a big gulp.