impeach, censure, attack
抨 centers on forceful verbal or physical opposition: impeaching, censuring, or attacking someone or something.
抨 combines 扌 (hand) with 平, which likely contributes the sound. The hand radical suggests an action of striking or opposing, fitting the meanings of attack and censure.
The hand radical 扌 beside 平 suggests a hand striking out to attack or censure someone, like a formal impeachment.
For ホウ, imagine a hand (扌) holding a hoe (ホウ) and using it to attack weeds in a field: hoe -> ホウ, and the hand strikes down the unwanted growth.