📒 to fall down or fall in suddenly, often after breaking apart
📒 to fall down (and usually become unconscious), especially because you are very ill
📒 to sit or lie down and relax, especially after working hard
📒 to fail suddenly or completely
📒 to decrease suddenly in amount or value
📒 to fold something into a shape that uses less space; to be able to be folded in this way
📒 if a lung or blood vessel collapses or is collapsed, it falls in and becomes flat and empty