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Children's Dictionary
cave-in a falling inward; collapse.
concave curved inward like the inside of a bowl. (Cf. convex.)
recess an area on a surface or edge that is hollow or bends inward. [1/4 definitions]
staple1 a short, thin piece of stiff wire shaped like a U. Staples are designed to be pushed through several sheets of paper and then bent inward to hold the papers together. [1/2 definitions]