What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
The South Asian tree Syzygium cumini (family Myrtaceae), cultivated for its fruit and as a shade tree; (also) the edible, dark crimson fruit produced by this tree; also called jambo, jambolan.
Early 19th century; earliest use found in John Loudon (1783–1843), landscape gardener and horticultural writer.