The Lemon Effect is a term used to describe the sour taste of lemons. It is also used to refer to the feeling of disappointment or dissatisfaction that can come from a bad experience. The term is derived from the fact that lemons are known for their sour taste, and the feeling of disappointment or dissatisfaction that can come from a bad experience can be likened to the sour taste of a lemon. PUCKER, the six-letter solution to the crossword, is another word for puckering up, which is the act of pursing one's lips in anticipation of a sour taste.