IPA: /ˈflætˌaɪərn/
KK: /ˈflætˌaɪərn/
A tool used to press clothes and remove wrinkles, typically heated to smooth out fabric.
She used a flatiron to make her shirt look neat and tidy before the meeting.
Flatiron → The word is formed from "flat" (from Old English *flett*, meaning level or smooth) and "iron" (from Old English *isern*, meaning metal). A flatiron is a tool made of iron that is flat in shape, used for smoothing clothes.
Think of something that is 'level' ('flat') and made of 'metal' ('iron') — that's why a flatiron is a flat tool used for smoothing.