A narrow, typically folding board with a heat‑resistant surface used as a flat support for ironing clothes.
2.
USUKinformalfigurative
A simile for something very flat, lacking curvature or padding; often applied to a person's chest, body, or to a hard, unyielding surface (e.g., a mattress).
3.
USUKneutralcolloquial
A metonymic reference to the place or surface used for ironing; by extension, a casual reference to the domestic task or setting where ironing is performed.