What does it mean to put money under the bed after moving?

This is a custom. This is a statement.

Some friends will put some coins or some change under the mattress when they first move into a new house, which forms the saying of lucky money. In fact, this is just a practice mentioned by ordinary people. The important thing is to put the money down and leave it behind.

Because whether you live in a house and pay attention to health or luck, wealth is everyone's first consideration, so putting money under the mattress is a statement of wealth.