There are multiple definitions - click on the translation that matches your context.

查封

动词

full

sequester

verb

Definitions of sequester

English

to restrict a jury's access to media and isolate them from contact with anyone not connected with the trial

Because the case was so widely discussed in the media, the judge ordered the jury sequestered to guarantee a fair trial.

English

to take legal possession of someone's assets; to take temporary possession of assets as security against a legal claim

The court can sequester the funds of unions that ignore court orders.