to slander, to libel, to criticize, chatty, gossipy
囋 centers on harmful or idle speech: slandering, criticizing, or gossiping in a chatty way. The meanings share the idea of using words to attack or chatter.
囋 combines 口 (mouth) with 贊, which likely contributes the sound and the idea of assisting or praising, but here the mouth radical shifts the meaning toward negative or excessive speech. The exact historical development is uncertain.
A mouth 口 beside 贊, which looks like a pile of words (貝 and other strokes). Imagine a mouth piling up words to slander or gossip.
For サツ, picture a gossipy person who slanders others in a sudden outburst: 'Satsu!' like a sharp, cutting remark. The sound 'satsu' cues サツ while the mouth 口 spreads harmful words.