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A teenager's sixteenth birthday, especially when considered as a rite of passage and sign of maturity. Most commonly said of girls. I don't want some big sweet sixteen party, Mom, really. I just want to go for my permit test. I can't wait to turn sweet sixteen so I can drive and have a later curfew!
See also: sweet
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.