Crevice

Definition: (from dictionary.com)
-noun
1. a crack forming an opening; cleft; rift; fissure

Examples:
"I looked into the crevice to see what lurked inside."
"The Duchess of Cambridge got her heel stuck in a crevice once so I feel better when it happens to me."

Origin: (from etymonline.com)
"mid-14c., from Old French crevace (12c., Modern French crevasse) 'gap, rift, crack' (also, vulgarly, 'the female pudenda'), from Vulgar Latin *crepacia, from Latin crepare 'to crack, creak;' meaning shifted from the sound of breaking to the resulting fissure."

Awkwardness rating: 7

Even royalty can be felled by a crevice! (itv.com)