I'm looking for a word or phrase to describe two people who would have spent long periods of time together, to the point where they know each other's idiosyncrasies, would have many in-jokes, finish each other's sentences etc.

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  • "duprass" , which, sadly, exists only for Vonnegut fans. – Carl Witthoft Oct 17 '17 at 18:40
  • There's always "bromance". – Hot Licks Oct 18 '17 at 1:25
  • Where and when do they spend this time? I've known guys at work who worked in the same bay for over a year and became good (work) friends. And they got to know each other pretty well. (Sigh) – AmE speaker Oct 18 '17 at 1:28
  • They frequent each other. (Yes, it's a bit unusual to talk this way, I suppose.) – Drew Oct 18 '17 at 4:10

Simpatico: "Being on the same wavelength," M-W

The word captures the idea of two or more people who are in tune with each other.


It is a bit old fashioned, but bosom buddies fits.

One's close or closest friend; a friend one holds dear to one's heart.
We grew up right next door to each other, so we have been bosom buddies since we were kids.
The Free Dictionary by FARLEX

A more modern (and informal) phrase would be brother from another mother.

These expressions don't refer to actual half-siblings. A brother from another mother is a friend that you feel as close to as if they were your actual brother.

  • Or just buddies. – AmE speaker Oct 18 '17 at 0:37
  • 1
    @Clare: I lose the Tom Hanks vibe with just buddies. – jxh Oct 18 '17 at 0:52

Best mates

That one person in your life who is like a sibling. You'll do anything for them, literally. They understand you, you understand them and you're always happy when you're around them. You just click.

Similar to best friend, but you can only really have one best mate, otherwise they are probably just good friends.

Urban Dictionary


Old friends are those who have had the time together to have had all those moments and formed all those jokes.


You could describe people with this kind of relationship as being "thick as thieves."

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