Past tense of halloo; shouted or called out loudly.
Regular past tense formation from 'halloo' by adding the -ed suffix, following standard English verb conjugation patterns that developed over centuries.
The doubling of 'l' in 'halloo' versus single 'l' in 'hello' shows how different regions preferred different spellings—this is why English spelling seems so chaotic, one word at a time.
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