| gulf(noun, deep, dip, hole, hollow) |
| hollow out(verb, expression, phrasal verb) |
| house(noun, place, cover, flat, informal) |
| knuckle(verb, break, drop, go, fail) |
| pad(noun, place, cover, flat, house) |
| spelunk |
| subside(verb, break, collapse, faint) |
| subterrane(noun, hole, hollow, cavern, pothole) |
| throw in the towel(verb, expression, idiom, break, drop) |
| abode(noun, place, flat, range, house) |
| accede(verb, break, drop, fail, agree) |
| accept(verb, lower, submit, bend, comply) |
| agree(verb, yield, surrender, endure, submit) |
| alcove(noun, space, capacity, extent, span) |
| antre |
| apartment(noun, place, cover, flat, house) |
| assent(verb, agree, yield, submit, admit) |
| bay(noun, concavity) |
| bottom(dip, concavity, cavern) |
| bowl |