sweeten up
phrasal verb
sweetened up; sweetening up; sweetens up
Definition of sweeten up
informal
: to be very nice to (someone) in order to get something
He's been trying to sweeten his mother up so she'll lend him the car.
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“Sweeten up.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sweeten%20up. Accessed 24 Jun. 2021.
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