How to read: そこをつく
Pronunciation: 
Names and idioms with total stroke of 20:
勇二郎 年初来 居道 何楼 章帝
Names and idioms similar to 底を突く:
底水 突撃戦 兀突骨 底気味 二番底
Yojijukugo(idioms with 4 Kanji characters) including 底を突く:
周知徹底 井底之蛙 釜底游魚
Idioms including 底を突く:
奈落の底 井底の蛙