from The Century Dictionary.
- noun A board upon which the bosom of a shirt or other garment is ironed.
Sorry, no etymologies found.
Use for ironing shirts a bosom-board, made of seasoned wood a foot wide, one and a half long, and an inch thick; cover it well by tacking over very tight two or three folds of flannel, according to the thickness of the flannel.
It is a plain, old-fashioned wooden chair, with a kind of bosom-board on the right arm, upon which Jefferson used to rest his Declaration of Independence whenever he wanted to write it.
A bosom-board, on which to iron shirt-bosoms, should be made, one foot and a half long, and nine inches wide, and covered with white flannel.