You can use lower to refer to the bottom one of a pair of things.

You can use lower to refer to the bottom part of something.

You can use lower to refer to people or things that are less important than similar people or things.

If you lower something, you move it slowly downwards.

If you lower something, you make it less in amount, degree, value, or quality.

If someone lowers their head or eyes, they look downwards, for example because they are sad or embarrassed.

If you say that you would not lower yourself by doing something, you mean that you would not behave in a way that would make you or other people respect you less.

If you lower your voice or if your voice lowers, you speak more quietly.