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noun a document issued by a legal or government official authorizing the police or another body to make an arrest, search premises, or carry out some other action relating to the administration of justice.

verb justify or necessitate (a certain course of action).

• The police obtained a warrant to search the suspect's house.
• The cops got a warrant to go through the guy's place.
• The feds got the green light to raid the dude's crib.
• His reckless behavior warranted a closer look by authorities.