1. To increase in size by a natural process.
a. To expand; gain: The business grew under new owners.
b. To increase in amount or degree; intensify: The suspense grew.
3. To develop and reach maturity.
To become an adult.
To ‘grow up’, in the way we use it to describe human development, means ‘learn up’. We become the adults we become through learning. (See: “I AM Learned“)