旁征博引 is an idiom
旁征博引páng zhēng bó yǐn
quote copiously from many sources; be well-provided with supporting information
旁：广泛；征：寻求；博：广博；引：引证。指说话、写文章引用材料作为依据或例证。
Example 宝钗妙玉则从徐说，～，用罚甚勤。（鲁迅《中国小说史略·清之人情小说》）
Word breakdown for “旁征博引”: Open in Reader →
旁HSK 5top 5kAmong the 5,000 most common words 1.one side2.other3.different4.lateral component of a Chinese character (such as 刂[dāo], 亻[rén] etc)+1 more 博top 5kAmong the 5,000 most common words 1.(bound form) abundant; plentiful; extensive; wide2.to win; to gain3.to play; to gamble4.learned; well-read+2 more+3 more 博愽top 5kAmong the 5,000 most common words old variant of 博[bó]
引HSK 4top 5kAmong the 5,000 most common words 1.to draw (e.g. a bow)2.to pull3.to stretch sth4.to extend+8 more+9 more