敲竹槓

extortion by taking advantage of sb's weakness

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

bamboo / CL:棵[ke1],支[zhi1],根[gen1] / Kangxi radical 118

coffin-bearing pole (old) / thick pole / bar / rod / thick line / to mark with a thick line / to sharpen (a knife, razor etc) / to get into a dispute with / standard / criterion