Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb warrant

2 senses of warrant

Sense 1
justify, warrant -- (show to be reasonable or provide adequate ground for; "The emergency does not warrant all of us buying guns"; "The end justifies the means")
       => confirm, reassert -- (strengthen or make more firm; "The witnesses confirmed the victim's account")

Sense 2
guarantee, warrant -- (stand behind and guarantee the quality, accuracy, or condition of; "The dealer warrants all the cars he sells"; "I warrant this information")
       => back, endorse, indorse, plump for, plunk for, support -- (be behind; approve of; "He plumped for the Labor Party"; "I backed Kennedy in 1960")