逾墙钻隙 is an idiom

逾墙钻隙yú qiáng zuān xì

逾：越过；钻：穿孔，打眼。越墙、钻洞。指对女子作挑逗的行为。

Origin 《孟子·滕文公下》：“不待父母之命，媒妁之言，钻穴隙相窥，逾墙相从，则父母国人皆贱之。”

Word breakdown for “逾墙钻隙”: Open in Reader →

variant of 逾[yú]

1.to exceed2.to go beyond3.to transcend4.to cross over+1 more +2 more

墙墻HSK 2

variant of 墙[qiáng]

墙牆HSK 2

1.wall (classifier: 面 [miàn], 堵 [dǔ])2.(slang) to block (a website) (usu. in the passive: 被墙[bèi qiáng])

variant of 钻[zuàn]

钻鑽HSK 6

1.to drill2.to bore3.to get into4.to make one's way into+5 more +6 more

1.drill; auger2.diamond

1.crack2.crevice3.gap or interval4.loophole+2 more +3 more