The Victorians had much influence on common terms - The avoidance of plain terms for bodily parts commonly is associated with the prudery of our Victorian ancestors though many of the evasions predate Queen Victoria's ascension to the throne in 1837.
People started saying darn instead of damn, to employ dashes (d – – –) when writing the harsher word, to perspire instead of sweat, to wear unmentionables instead of trousers and breeches, to have stomachaches instead of bellyaches, to use nude rather than naked when referring to human figures in painting and sculpture, and to be laid to rest, not buried in a cemetery.
The taboo on breast was so strong that it was replaced by bosom in many contexts during the following century. Decorative breast knots on dresses became bosom knots, breast pins became bosom pins, and even otherwise earthy English farmers were known to refer to the breast, or forward part of the moldboard of a plow, as its bosom.
Most likely, the reluctance to say breast also explains why William Congreve’s line in The Mourning Bride, “Music has charms to soothe a savage breast,” is often misquoted as “Music has charms to soothe a savage beast.”