Meaning of “it's a small world” in the English Dictionary

british dictionary

"it's a small world" in British English

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it's a small world

saying

said to show your surprise that people or events in different places are connected:

You know my old science teacher! Well, it's a small world, isn't it?

(Definition of “it's a small world” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)