Goods or services that are cheap cost less money than usual or than you expected.

If you describe goods as cheap, you mean they cost less money than similar products but their quality is poor.

If you describe the cost of someone's work as cheap, you disapprove of the way people are taking advantage of a situation to pay someone less than they should for the work that they do.

If you describe someone's remarks or actions as cheap, you mean that they are unkindly or insincerely using a situation to benefit themselves or to harm someone else.

If you describe someone as cheap, you are criticizing them for being unwilling to spend money.

You use life is cheap or life has become cheap to refer to a situation in which nobody cares that large numbers of people are dying.

If someone does or buys something on the cheap, they spend less money than they should because they are more concerned with what it costs than with its quality.