What does 'to hang out together' mean?

[Babi]

English Language Tests, Intermediate level

ESL/EFL Test #705 "English Slang Idioms (447)", question 9

"Do you want to come to my house for a cup of coffee so we can catch up? It's been a long time since we hung ......... together," Linda said to Brandy.

(a) on
(b) off
(c) over
(d) out

English Language Tests, Intermediate level

ESL/EFL Test #705 "English Slang Idioms (447)", answer 9

"Do you want to come to my house for a cup of coffee so we can catch up? It's been a long time since we hung out together," Linda said to Brandy.

Correct answer: (d) out

Your answer was: incorrect
"Do you want to come to my house for a cup of coffee so we can catch up? It's been a long time since we hung on together," Linda said to Brandy.
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Please help me! To hang out together?

[Alan]

Hi Babi,

'Hang out together' is an expression suggesting that you spend some time with somebody - having fun/sharing interests/doing things together with friends.

Alan
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English as a Second Language
You can read my ESL story Present Simple