Examples:

• The used car I bought turned out to be a lemon; it broke down after just a week.
• She regretted buying that laptop; it's been nothing but a lemon since day one.
• This phone has been giving me so many problems; it's definitely a lemon.
• They sold us a lemon of a dishwasher; it leaks water everywhere.
• The new lawnmower was supposed to be top-notch, but it's proving to be a lemon.
• Don't buy that brand; their products are often lemons.
• He thought he got a great deal on that stereo system, but it ended up being a lemon.
• We had to return the refrigerator; it turned out to be a lemon and kept overheating.
• The company recalled thousands of cars because they were lemons right off the assembly line.
• I wouldn't recommend that restaurant; every dish we ordered was a lemon.
• The computer software they installed is full of bugs; it's a lemon.
• After the concert, he complained that the sound system was a lemon; it kept cutting out.
• They advertised it as a luxury item, but it's just a lemon dressed up to look good.
• The contractor promised quality work, but the renovations turned out to be a lemon.
• She realized her investment in that company was a lemon when it went bankrupt.