扣留 (kòu liú): to detain sb; to hold sb against their will; to withhold (property, documents, funds etc)

The customs officer suspected him of carrying contraband, so he was detained at the airport for further investigation.

The police detained the suspicious man at the crime scene and only released him after confirming he was not involved in the case.

Because his visa had expired, he was detained by the immigration office for three days and finally deported.

During the war, the enemy troops detained hundreds of civilians as hostages, triggering strong condemnation from the international community.

According to the law, police cannot arbitrarily detain citizens for more than 24 hours without an arrest warrant.