"Don't worry, your car will be ready tomorrow", the mechanic assured him.
Synonyms and examplespromiseI promise that I'll be home before dark.
guaranteeI can't guarantee that the operation will be successful.
give (someone) your wordformalHe gave me his word that the job would be finished on time.
swearI didn't know what happened, I swear.
pledgeWe are asking people to pledge their support for our campaign.
resolveI have resolved to lose ten pounds.
vowI vowed I would never speak to him again.
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If youpromise somethingto someone, you are saying that you will do that thing or that you will make sure it happens.