ぐぐっと

adverb

with a burst of strength; in one go; rapidly

Mimetic adverb describing a sudden, forceful action done all at once, often with physical effort or momentum.

• 彼かれはぐぐっと一いっ気きにビールを飲のみ干ほした。

  He downed the beer in one go with a burst of strength.

• ぐぐっと押おしたら、重おもい扉とびらが開ひらいた。

  When I pushed with a burst of strength, the heavy door opened.