Cách sử dụng
"Wax and wane" is an expression that refers to something that goes through cycles of growth and decline. It is often used to describe the changing brightness of the moon as it gets bigger and smaller throughout the month. For example, we might say that the moon waxes and wanes as it moves through its phases. This expression can also be used more broadly to refer to anything that experiences periods of increase and decrease over time. For example, a business might wax and wane as it grows and suffers setbacks, or a person's interest in a hobby might wax and wane depending on their level of enthusiasm.