lo

Inherited from Middle English lo, loo, from Old English lā (“exclamation of surprise, grief, or joy”). Conflated in Middle English with lo! (interjection), a corruption of lok!, loke! (“look!”) (as in lo we! (look we!)). Cognate with Scots lo, lu (“lo”). See also look.

出典: Wiktionary「lo」（CC BY-SA 4.0）