collapse, collapsing, collapsed, collapses, to fall down, fall down
Mnemonic
[t-] Tarzan is in [1] front of the [-a] auditorium where he is camping out for tickets. Using his primitive construction skills, he constructs a camp-out tent out of 土 soil and 羽 feathers that he lives under until the tickets go on sale. Unfortunately the 日 sun is so bright and hot that it dries out the primitive tent, which then 塌 collapses onto Tarzan, who is now shelter-less and covered with 土 soil and 羽 feathers.