What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
Either of the two prepubic or epipubic bones extending forward from the anterior edge of the pelvis into the abdominal wall of marsupials, monotremes, and certain multituberculates.
Early 19th century; earliest use found in James Parkinson (1755–1824), surgeon and palaeontologist.