敲山震虎

a deliberate show of strength as a warning

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

mountain / hill / anything that resembles a mountain / CL:座[zuo4] / bundled straw in which silkworms spin cocoons / gable

to shake / to vibrate / to jolt / to quake / excited / shocked / one of the Eight Trigrams 八卦[ba1 gua4], symbolizing thunder / ☳

tiger / CL:隻|只[zhi1]