ギシギシ

adverb, adverb taking the 'to' particle

creaking; squeaking

Describes a harsh, grating sound, like a floorboard or door hinge under strain. Often used with と.

• 古ふるい階かい段だんがギシギシと音おとを立たてた。

  The old stairs creaked loudly.

adverb

tightly; crammed; squeezed

Describes something packed or squeezed tightly, often uncomfortably. Commonly used as ギシギシに.

• 満まん員いん電でん車しゃで乗じょう客きゃくがギシギシに詰つめ込こまれていた。

  Passengers were packed tightly in the crowded train.

adverb, adverb taking the 'to' particle

relentlessly; severely; harshly

Used for persistent, harsh criticism or complaining. Often with verbs like 言う, 責める, or 批判する.

• 上じょう司しにミスをギシギシ責せめられた。

  My boss relentlessly criticized me for the mistake.