A person(typically female) who shys away from any sort of confrontation. Typically, this person will not stand up for themselves or anything else. Opposite of bold, brash, or confident.
Lucy was no shrinking violet, she told it like she saw it.
Going shopping after having a cocktail (or two, or three); shopping while drunk. Generally most noticeable the next day when you realize what you (probably shouldn't have) bought.
(At the checkstand) Wow, look at my cart - - I'm totally shrunking!
What was I thinking, buying that outfityesterday? I must have been really shrunking!