How to read: そこをつく
Pronunciation: 
Names and idioms with total stroke of 20:
華原 交雑 野竿 一波万波 於茶々
Names and idioms similar to 底を突く:
払底 玉突 底長 缶底 仙骨底
Yojijukugo(idioms with 4 Kanji characters) including 底を突く:
徙薪曲突 井底之蛙 釜底游魚
Idioms including 底を突く:
底が浅い 膝を突き合わせる