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Can someone explain what " We need to touch base" means? An example would be appreciated. Thanks.
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it just means to check with each other, or to get a "reality check" it is idiomatic, used in some business circles,

it may be derived from US football or the idea of a "base" camp on an expedition, I dont know - that bit's just guessing!
Comments  
"Before you turn in your report, let's touch base and see if we got the same answers."
"I try to touch base with my boss once a day whenever he's traveling."
"Next time, touch base with me before you shoot your mouth off."