From Middle English halou, halow, halloo (interjection used to call attention), representing Old English hēlā, ǣlā, ēalā (“O!, alas!, oh!, lo!”), equivalent to hey + lo.
Meanings
(alt-of, alternative) Alternative form of hello (“greeting”).
Hallo father, here’s Pecksniff! 1842 December – 1844 July, Charles Dickens, The Life and Adventures of Martin Chuzzlewit, London: Chapman and Hall, […], published 1844, →OCLC:
(dated) A cry of surprise.
It sounds like a sum in the rule of three. The answer should give us the— But hallo! here are the accredited representatives of the law. 1890 February, A[rthur] Conan Doyle, “Sherlock Holmes Gives a Demonstration”, in The Sign of Four (Standard Library), London: Spencer Blackett […], →OCLC, page 98:
From Middle English halou, halow, halloo (interjection used to call attention), representing Old English hēlā, ǣlā, ēalā (“O!, alas!, oh!, lo!”), equivalent to hey + lo.
From Middle English halou, halow, halloo (interjection used to call attention), representing Old English hēlā, ǣlā, ēalā (“O!, alas!, oh!, lo!”), equivalent to hey + lo.
Meanings
(intransitive) To shout, or to call with a loud voice.
Tom was just hiding behind a wall, […] but the groom saw him, and halloed to him to know where Mr. Grimes, the chimney-sweep, lived. 1863, Charles Kingsley, The Water Babies: A Fairy Tale for a Land Baby: