noun, takes する, transitive verb

  1. muzzling (someone), gagging, forcing (someone) to keep quiet (about something).
  2. silencing (someone), killing (someone) to prevent them from revealing something. Colloquialism, messages.euph.

Variations

Pronunciation Kanji Kana Is Common
 
口封じ くちふうじ

Contained Kanji Breakdown

mouth
くち コウ ク (1st, N4)
seal, closing
フウ ホウ (8th, N2)
square jewel, corner, angle
ケイ ケ か (Kentei Pre-1, N1)
soil, earth, ground
ド つち は (1st, N5)
measurement, tenth of a shaku, a little
スン す みき (6th, N1)