吱吱嘎嘎

zī zī gā gā

(onom.) creaking and grating

吱

zī

(onom.) chirp; squeak; creak

吱

zī

(onom.) chirp; squeak; creak

嘎

gā

(onom.) short but loud sound

嘎

gā

(onom.) short but loud sound