noun
severe attack; harsh criticism
Figurative use: a sharp verbal or written attack, like a painful blow. Often used in contexts of strong rebuke or biting critique.
彼の論文は痛棒を食らわすような内容だった。
His paper was a scathing critique.
社長から痛棒を浴びせられた。
I received a harsh rebuke from the company president.
noun
Zen stick; keisaku
Literal use: a flat wooden stick used in Zen meditation to strike meditators who are drowsy or inattentive. Also known as 警策 (けいさく).
坐禅中に眠くなると、和尚が痛棒で肩を打つ。
If you get sleepy during zazen, the monk strikes your shoulder with the keisaku.