Dictionary

To frown; to look sullen.

To be dark, gloomy, and threatening, as clouds; of the sky: to be covered with dark and threatening clouds; to show threatening signs of approach, as a tempest.

To let descend by its own weight, as something suspended; to let down

Example: lower a bucket into a well

To pull down

Example: to lower a flag

To reduce the height of

Example: lower a chimney or turret

To depress as to direction

Example: lower the aim of a gun