A dustpan is the flat little shovel you sweep dirt into. A dustpan and brush, hold the dustpan, empty the dustpan.
It always comes as a pair with a brush, and the long-handled kind exists so that nobody has to kneel. The edge must sit flat on the floor or a line of dust stays behind, which is the whole reason the cheap ones are infuriating.
1noundustpanThe flat little shovel you sweep dirt into.
“She swept the broken glass into a dustpan and threw it away.”
dustpan is a tool.
Dust plus pan, a plain compound from the eighteenth century.
From dust + pan.
Etymology from Wiktionary, CC BY-SA