The meaning of LO is —used to call attention or to express wonder or surprise. How to use lo in a sentence. Lo definition: look! see! (frequently used in Biblical expressions; now usually used as an expression of surprise in the phraselo and behold ).. See examples of LO used in a sentence. lo in British English (ləʊ ) exclamation look! see! (now often in the phrase lo and behold) Idiom lo and behold (Definition of lo from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press) lo2 (lō), adj. an informal, simplified spelling of low 1, used esp. in labeling or advertising commercial products: lo calorie. Define lo. lo synonyms, lo pronunciation, lo translation, English dictionary definition of lo. interj. Used to attract attention or to show surprise. American Heritage® Dictionary of the English Language, Fifth Edition. Look up LO, Lo, lo, or -lo in Wiktionary, the free dictionary. Definition of lo exclamation in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. Mar 3, 2025 · The word "lo" functions primarily as an interjection, capturing attention or emphasizing surprise. However, in its informal use as an abbreviation of "low," it can function as an adjective or part of a compound modifier. Lo definition: Used to attract attention or to show surprise.