Which is correct?
I'd normally say "touch base" with somebody. But then others may have a different opinion on this.
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I'd choose "touch bases", WB (if I may shorten your name)
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 julielai's reply was promoted to an answer.
... Emotion: tongue tied ...
I may be wrong, too...
It's more common to use it as in "I'm going to go home and touch base for a while" I think.

Using it for simply meeting someone it a bit of a silly extension of the meaning, in my opinion, but used in that way I should say either "touch base" or "touch bases" could crop up.
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I guess you can choose anything you'd like, but if you want to be correct you may consider using "Touch Base". Please see http://www.wsu.edu/~brians/errors/touchbases.html or read the book: Common Errors in English Usage by Paul Brians.
No gotta be "touch base". You dont each have a personal base you are touching together. You meet at one communal base to update each other with information.
Its actually extremely common in North America to say "We will touch base" or i will touch base with you" meaning you will follow up with someone or contact them at a later time.

I have never heard anyone saying "I'm going to go home and touch base for a while"- that is definitely incorrect.
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To touch base, or touch basis.
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