based off

Verbal phrase selecting one of the infinitude of things that something is not based on.

Want to hear my new idea for a weapon? It's based off The Little Mermaid by Hans Christian Anderson. What? Oh sorry, it's based on laser technology.

based off of

a way to say "based on" when you want to sound dumb and use an extra syllable

"The movie was based off of the book."

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based off of

Verbal phrase that identifies one of the infinitude of things that something is not based on.

Want to hear my new idea for a weapon? It's based off of The Little Mermaid by Hans Christian Anderson. What? Oh sorry, it's based on laser technology.

off base

(adj. and adv.) Not right, not correct, impolite, rude, improper, treyf, crazy; not ready, not alert; in baseball and softball, not touching one of the bases and thus vulnerable to being tagged out.

"I don't like Hillary either, but his remarks about her were way off base."

"Joe was off base so he was easily tagged out."

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off base

1. not appropriate

2. by surprise

3. incorrect, not accurate

His claims are totally off base.

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