This is the 4747th most frequent Chinese word.
立案
To file or register a case (in a legal or official context).
In this context, '立案' refers to the action by judicial authorities to formally accept a case for legal proceedings.
由于证据不足，法院暂时不能立案。
Due to insufficient evidence, the court cannot file the case for now.
Here, '立案' is used to describe the procedural step of officially registering a case after a complaint is made.
提起诉讼后，律师要求尽快立案。
After initiating a lawsuit, the lawyer requested to promptly file the case.
Here, '立案' means to file or register a case for official investigation by authorities.