warrant [ˈwɒrənt]

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n.正当理由，根据，委任状，准许；vt.保证，辩解，担保，授权

to make a particular activity necessary

I will warrant him an honest and reliable fellow. 我可以保证他是一个诚实可靠的人。
The commissioner has issued a warrant for her arrest. 专员发出了对她的逮捕令。