no obj.
1- make a loud crunching noise发出嘎吱嘎吱的声响：
crisp yellow leaves scrunched satisfyingly underfoot.
脚下干脆的黄叶发出令人惬意的吱吱声。
1.1
- with obj. and adverbial crush or squeeze (something) into a compact mass挤压成团：
Flora scrunched the handkerchief into a ball.
弗洛拉把手绢揉成一团。
1.2
- no obj., with adverbial become crushed or squeezed in such a way受到挤压：
their faces scrunch up with concentration.
他们全神贯注绷紧了脸。
1.3
- with obj. style (hair) by squeezing or crushing it in the hands to give a tousled look（双手挤弄头发）给头发造型。
in sing.
- a loud crunching noise嘎吱嘎吱的声响：
Charlotte heard the scrunch of boots on gravel.
夏洛特听到了长筒靴走在砾石路上嘎吱嘎吱的声响。
词源
late 18th cent. （in the sense 'eat or bite noisily'）：probably imitative; compare with CRUNCH.