"Digit" means a finger, so we say how much alcohol to put in a drink by saying how many fingers high to fill the glass with a finger or two or three wrapped around the glass. A finger is about an ounce, I think.
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Grammar GeekTwo fingers. When you pour liquor into a glass, imagine holding your first two fingers parallel to the table against the base of the glass. Stop pouring when the liquor reaches the same height as the top of your finger. That's two fingers' of whiskey.A couple = twodigits = fingers (in this case).