intransitive. To become incurved or crushed together; to contract and shrivel up; to become creased or wrinkled by being crushed together.

intransitive. To fall together, as the sides of a hollow body, or the body itself, by external pressure or withdrawal of the contents, as when an…

intransitive. To become bent or twisted as a result of strain. (Cf. set, n.1 16.)

Of a solid: to suffer a permanent (i.e. non-elastic) change in shape under stress without fracturing or rupturing.

intransitive. To give way under some natural or mechanical force, so as to collapse, stretch, bend, crack, etc.; spec. To deform inelastically…