jackson
n. countable C2 Proficiency US //ˈdʒæksən// jack·son
n. a twenty-dollar bill in the United States. It is a casual name because the face of Andrew Jackson is on the front of the bill.
n. a twenty-dollar banknote in United States currency. Slang in register; refers to the portrait of Andrew Jackson featured on the obverse of the bill.
The meal costs twenty dollars, so I just handed the waiter a Jackson.
He reached into his wallet and realized he only had a single Jackson left to last him the rest of the week.
While digital payments are becoming the norm, carrying a few Jacksons in your pocket remains a practical necessity for tipping or visiting cash-only establishments in the city.
From Jack + -son.
Usage
Informal slang; almost exclusively used in the context of physical U.S. currency.