I promise you

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I (can) promise you

I can guarantee with total confidence (that something is the case). If you don't accept this plea bargain, I can promise you that the judge is going to sentence you to life in prison if you're convicted. You will have such a rewarding experience if you go for this exchange trip, I promise you.
See also: promise
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.

I (can) ˈpromise you

(informal) used as a way of encouraging or warning somebody about something: I can promise you, you’ll have a wonderful time.If you don’t take my advice, you’ll regret it, I promise you.
See also: promise
Farlex Partner Idioms Dictionary © Farlex 2017
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