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Douglas Harper's Etymology Dictionary
grab-bag

"miscellaneous mixture," 1854, originally a carnival game; from grab + bag (n.).

Wiktionary
grab-bag

n. (alternative spelling of grab bag English)

Usage examples of "grab-bag".

Maraud was a grab-bag of types, because it had originally been part of the Dominant Republic, then taken by pirates who settled it with a number of their captives.