敲钉钻脚

to make doubly sure (idiom)

to hit / to strike / to tap / to rap / to knock / to rip sb off / to overcharge

nail / to follow closely / to keep at sb (to do sth) / variant of 盯[ding1]

to join things together by fixing them in place at one or more points / to nail / to pin / to staple / to sew on

variant of 鑽|钻[zuan4]

to drill / to bore / to get into / to make one's way into / to enter (a hole) / to thread one's way through / to study intensively / to dig into / to curry favor for personal gain

an auger / diamond

foot / leg (of an animal or an object) / base (of an object) / CL:雙|双[shuang1],隻|只[zhi1] / classifier for kicks

variant of 角[jue2] / role