collapse (v.) Look up collapse at Dictionary.com
1732, from Latin collapsus, past participle of collabi "fall together," from com- "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.
collapse (n.) Look up collapse at Dictionary.com
1801, from collapse (v.).