what goes up must come down

what goes up must come down

1. (figurative) All trends will end; a rise (in the stock market, in a person's political or social influence, etc.) will be followed by a fall.
2. (figurative) Substance induced euphoria is followed by withdrawal (often used to describe stimulants though same applies to many other drugs).

• every dog has its day, the meek shall inherit the earth (≈"what is down will go up")