1. To be something which is not large in physical size; or not as large in volume or amount; or not as wide. English = (be) small, (be) less, (be) narrow.
2. To make something become not as big in size; or in width; or in volume; or in intensity. English = make small, narrow, lessen, reduce, decrease.
3. To be not as much in amount or degree as before or as something else. English = (be) less.