Using 'pop in', 'pop out', and 'pop round' (BBC Learners' Questions)

source: BBC Learning English    2017年2月24日
Marita from Spain asks ''What's the difference between pop in, pop out, and pop round?'' Dan has the answer.
These verbs are phrasal verbs, i.e. they are a verb combined with a preposition. In this context pop means go somewhere for a short period of time.
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