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undercover acting in secret, e.g. an undercover police officer adj.
law	متخفّي، سرّي
English thesaurus
undercover ['ʌndə'kʌvə] adj.
law	acting in secret involving the secret gathering of information, e.g. an undercover police officer   ؛A person participating in a secret investigation in order to acquire information about the crime without the other party realizing their identity