collapse (n.) Look up collapse at Dictionary.com
1801, from collapse (v.).
collapse (v.) Look up collapse at Dictionary.com
1732, from Latin collapsus, past participle of collabi "fall together," from assimilated form of com "with, together" (see com-) + labi "to fall, slip" (see lapse (n.)). The adjective collapsed is attested from c. 1600, from Latin collapsus, and perhaps this suggested a verb. Related: Collapsing.