(informal, idiomatic) Legitimate; honest; upright.
Before paying any money, make sure the organization is on the up-and-up.
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(UK, informal, idiomatic) Becoming more successful; on the rise.
You double-cross me, you son of a bitch. I bet English gave you a sawbuck so he could take her out and give her a jump, and you sit back there collecting fifty bucks from me becuss I'm sap enough to think you're on the up-and-up with me.
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Add your own interpretation of "on the up-and-up".
Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.