Collapsible comes from collapse + -ible, from Latin collapsus, past participle of collābī 'to fall together, collapse', from com- 'together' + lābī 'to slip, fall'. The historical trail runs through collābī in Latin and lābī in Latin. Morphologically, collapsible is transparent: it draws on collapse + -ible, from Latin collapsus, past participle of collābī 'to fall together, collapse', from com- 'together' + lābī 'to slip, fall'. Used as an adjective, collapsible now means "able to be folded or compressed into a smaller form", so the present definition can be read against the older forms and meanings. The same lexical family is also visible in derived forms such as collapsibility and related forms such as collapse and collapsed. The result is a borrowed or transmitted form whose modern spelling carries a compact record of its route into English.