1col·lapse 
/kəˈlæps/ verb
col·laps·es; col·lapsed; col·laps·ing /kəˈlæps/ verb 1 [no obj] : to break apart and fall down suddenly
▪ The bridge/building collapsed. ▪ The roof collapsed under a heavy load of snow. ▪ The chair he was sitting in collapsed. 2 [no obj] a : to fall down or become unconscious because you are sick or exhausted
▪ He collapsed on stage during the performance and had to be rushed to the hospital.
b : to completely relax the muscles of your body because you are very tired, upset, etc.
▪ She came home from work and collapsed on the sofa. ▪ The crying child ran to his mother and collapsed in her arms. 3 [no obj] a : to fail or stop working suddenly : to break down completely
▪ The civilization collapsed for reasons that are still unknown. ▪ He warned that such measures could cause the economy to collapse. ▪ Negotiations have completely collapsed.
b : to lose almost all worth : to become much less valuable
▪ The country's currency collapsed. ▪ Oil prices had collapsed. 4 [no obj] medical : to become flat and empty
▪ a blood vessel that collapsed ▪ a collapsed lung 5 : to fold together [no obj] ▪ The stroller collapses easily. [+ obj] ▪ You can collapse the stroller easily and store it in the trunk of your car.
▪ The bridge/building collapsed. ▪ The roof collapsed under a heavy load of snow. ▪ The chair he was sitting in collapsed.
▪ He collapsed on stage during the performance and had to be rushed to the hospital.
b : to completely relax the muscles of your body because you are very tired, upset, etc.
▪ She came home from work and collapsed on the sofa. ▪ The crying child ran to his mother and collapsed in her arms.
▪ The civilization collapsed for reasons that are still unknown. ▪ He warned that such measures could cause the economy to collapse. ▪ Negotiations have completely collapsed.
b : to lose almost all worth : to become much less valuable
▪ The country's currency collapsed. ▪ Oil prices had collapsed.
▪ a blood vessel that collapsed ▪ a collapsed lung
— col·laps·ible /kəˈlæpsəbəl/ adjective
▪ a collapsible chair/table/stroller
/kəˈlæpsəbəl/ adjective ▪ a collapsible chair/table/stroller
