expression, suru verb (irregular)
suppress free speech; muzzle expression
Used for actions that stifle public discourse, often by authorities or through intimidation.
政府は反対意見を封殺するために言論を封殺した。
The government suppressed free speech to silence dissenting opinions.
言論統制 refers to systematic control or regulation of speech, while 言論を封殺する emphasizes the act of forcibly suppressing or shutting down expression.
Compound of 言論 (speech, discourse) + を + 封殺する (to suppress, to block). 封殺 originally means 'to seal off and kill' and is used metaphorically for suppression.