The meaning of OUTSIZE is an unusual size; especially : a size larger than the standard. How to use outsize in a sentence.

The adjectives outsize and outsized have the same meanings ("unusually large or heavy" and "exaggerated or extravagant in size or degree") and they appear in the same contexts; they're technically what we call variants. (Outsize alone also functions as a noun—it means "an unusual size" and especially refers to "a size larger than the standard," as in "a store specializing in outsizes"—but ...