1) Caving in 
• (p. pr. & vb. n.) of Collapse
collapse, collapsed, collapsing, collapses 1. To fall down or inward suddenly; to cave in. 2. To break down suddenly in strength or health and cease to function; such as, a patient who collapsed as she was walking. 3. To fold compactly;for example, temporary fencing that collapses. 4. The act of falling down or inward, as from a loss of supports...