ぐしぐし

adverb, adverb taking the 'to' particle

grumbling; complaining; muttering

Describes the sound or manner of someone grumbling or complaining under their breath, often with a repetitive, low-voiced quality.

• 彼かれはいつもぐしぐし文もん句くを言いっている。

  He's always grumbling complaints.

• ぐしぐし言いわずにさっさとやりなさい。

  Stop muttering and just get on with it.

adverb, adverb taking the 'to' particle

crumpling; crushing

Describes the sound or action of crumpling something like paper, or crushing something soft and yielding.

• 紙かみをぐしぐしに丸まるめて捨すてた。

  I crumpled the paper into a ball and threw it away.