What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
The eating of eggs; (now especially) the consumption by a developing fetus of ova produced by the mother (notably in some shark species).
Mid 19th century; earliest use found in Ibis: a quarterly journal of ornithology. From oo- + -phagy, originally after German Oophagie.