| sour | (informal) someone with a habitually sullen or gloomy expression |
|---|---|
| sour | large spiny tropical fruit with tart pulp related to custard apples |
| sour | small tropical American tree bearing large succulent slightly acid fruit |
| sour | small tropical American tree bearing large succulent slightly acid fruit |
| sour | deciduous shrubby tree of eastern North America having deeply fissured bark and sprays of small fragrant white flowers and sour-tasting leaves |