The word **席卷** (xíjuǎn) is a classical Chinese idiomatic expression formed through metaphorical composition, where **席** (mat/blanket) acts as the noun and **卷** (to roll up) as the verb, literally meaning "to roll up like a mat." This vivid image evokes the swift, thorough, and all-encompassing action of gathering or conquering something completely, as one would efficiently roll up and carry away a floor mat. Over time, it has semantically extended to describe any force—such as a trend, movement, or army—sweeping across and overwhelming an area or domain entirely and with great speed.