Base off of is an American informal verbal construction meaning to use something as a foundation or reference point — to base something on something else. The doubled preposition ('off of' instead of standard 'on') is a casualism widely used in informal American English and frequently stigmatised by prescriptivists. It appears naturally in everyday speech and informal writing, particularly among younger speakers, though edited prose typically substitutes the simpler 'base on.'
The whole campaign was based off of research they had done two years earlier, and some of it was already outdated.
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(ditransitive, US, informal) To base on.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.