Meaning of the word "knee high to a grasshopper" in English

What does "knee high to a grasshopper" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

knee high to a grasshopper

US /niː haɪ tuː ə ˈɡræsˌhɑːpər/
UK /niː haɪ tuː ə ˈɡrɑːsˌhɒpər/

Idiom

very small or young

Example:
When I was knee high to a grasshopper, my grandpa used to tell me stories.
He's been working on cars since he was knee high to a grasshopper.