instead of
In the place of; in substitution for; in preference to; rather than.
I wore mittens instead of gloves.
The grown-ups had coffee but the children wanted milk in place of coffee.
The boys went fishing instead of going to school.
The Vice-President talked at the meeting in place of the President, because the President was sick.
The magician appeared on the program in lieu of a singer.
Compare: IN PERSON.
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Source: A Dictionary of American Idioms