This idiom means something is found everywhere or in great numbers, similar to 'ubiquitous' or 'commonplace'.
比比一个挨一个。到处都是，形容极其常见。
《战国策·秦策一》犯白刃，蹈煨炭，断死于前者，比是也。”宋·包拯《请救济江淮饥民疏》年亢旱，民食艰阻，流亡者比比皆是。”
In the city, coffee shops are everywhere, one after another, truly bǐ bǐ jiē shì.
Learn the next connected idiom: 比比皆是 (bǐ bǐ jiē shì) → 是非曲直 (shì fēi qǔ zhí)
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