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Douglas Harper's Etymology Dictionary
bold-face

in typography, 1845, from bold (adj.) + face (n.). In reference to types, bold (adj.) is attested from 1790, perhaps from the secondary sense "easily visible, striking to the eye."\n

Usage examples of "bold-face".

He was followed closely by Fitch who chugged along behind and grinned in bold-faced relief.

He was a bold-faced rascal, a thief, he added, and occasionally a highwayman.

They have used bold-faced letters, Gothic-type letters, Greek letters, both capital and small, subscripts, superscripts, asterisks, even Hebrew letters.