noun
a small, slender measuring device for liquor, typically holding 1 1/2 ounces
verb
to alter or manipulate in a way that is not strictly honest or legal, often in a small or subtle way
-
The bartender used a jigger to measure out the exact amount of liquor for each cocktail.
-
Can you pass me that jigger so I can pour myself a drink?
-
I can't believe he jiggered the results of the experiment to make himself look better.
-
She had to jigger her schedule to fit in all of her appointments.