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base off of

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.

ˈbeɪs ˈɔf ˈʌv41 viewsLast reviewed Jun 29, 2026+ Add a definition
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#1·Apr 28, 2026

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The whole campaign was based off of research they had done two years earlier, and some of it was already outdated.
Origin: Ditransitive extension of 'base on'; 'off of' as a compound preposition is characteristic of informal American English. Editorial expansion authored on Slangora.
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#2·Apr 27, 2026

(ditransitive, US, informal) To base on.

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