Why do we chop a tree down and then chop it up? English has many vagaries, and yours is one. 'In' refers to the blank spaces that we must write information in; 'out' means 'completely', as in 'buy out' or 'dry out' and refers to completing the form.
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naotoshiWhy do "fill in" and "fill out" have similar meanings, even though "in" and "out" are opposite words?Heaven only knows why certain meanings have developed for some words and phrases. Fill in and fill out can indeed have exactly the same meaning, but one is more British and the other m
Example: fill in/fill out a questionnaire.
naotoshiWhy do "fill in" and "fill out" have similar meanings, even though "in" and "out" are opposite words?Why indeed.