ギシギシ;ぎしぎし /(adv,adv-to) (1) (on-mim) with a creak/with a squeak/(adv) (2) (oft. as 〜に) (on-mim) (packing) tightly/with a squeeze/(adv,adv-to) (3) (on-mim) relentlessly (criticize, complain, etc.)/severely/EntL2115420/