Idiom: they've been walking out together

[michael clinton]

English Language Tests, Intermediate level

ESL/EFL Test #101 "Phrasal Verb: Walk", question 1

They've been seeing each other for 6 months now or, as we used to say, they've been walking ......... together.

(a) in
(b) out
(c) through
(d) off

English Language Tests, Intermediate level

ESL/EFL Test #101 "Phrasal Verb: Walk", answer 1

They've been seeing each other for 6 months now or, as we used to say, they've been walking out together.

Correct answer: (b) out
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I can?t understand this question number one.

[Alan]

Hi michael clinton,

This expression is an oldfashioned way to describe a couple who are dating each other as boyfriend and girlfriend.

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

[Saneta]

walk out together (oldfashioned)= go out together (modern?)?

thanks

[Alan]

Yes.
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English as a Foreign Language
You can read my EFL story Progressive Forms