Grapes are small green or dark purple fruit which grow in bunches. Grapes can be eaten raw, used for making wine, or dried.
PHRASE
酸葡萄心理（指因得不到想要的东西便说它一文不值）
If you describe some-one's attitude as sour grapes, you mean that they say something is worthless or undesirable because they want it themselves but cannot have it.