always followed by an adverb or preposition [no obj] :to make your body lower or shorter by bending your legs, making your back bend forward, lowering your head, etc.

[+ obj] :to tighten the muscles of (your face or nose) - usually + up

[+ obj] to put (several or many people or things) in a space that is too small - usually used as (be) scrunched

to press or squeeze (something) so that it is no longer flat or smooth

always followed by an adverb or preposition [no obj] :to make the loud sound of something being crushed