| pressure trough | 2.44 | A weak low pressure trough is moving westward today across Puerto Rico. | ||
| upper-level trough | 1.97 | An upper-level trough will continue to move to the east of the area. | ||
| water trough | 1.25 | He was afraid to walk past a water trough. | ||
| horse trough | 0.53 | There was a marble fountain and marble horse trough. |