As a Noun:
1. The measurement from the top to the bottom of a person or thing, especially when that distance is thought to be small or below the average. English = lowness
As a Verb or Adjective:
1. Of people or things, to measure a small or below average distance from the top to the bottom. English = (be) short, (be) low.
2. To become lower or shorter; or to move downwards to a lower location.
3. To reduce in quantity or size. English = decrease.
4. To move into or be located at a less important position in an organisation; to be unimportant or low in status.
Note:
1. The lower or shorter the thing is, the lower you place your hand in the starting position. Your handshape becomes completely flat at around waist height.