be knee-high to a grasshopper
US /bi ni haɪ tu ə ˈɡræsˌhɑpər/
UK /bi ni haɪ tu ə ˈɡræsˌhɑpər/
1.
很小, 年幼
to be very small or young
:
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I remember him when he used to be knee-high to a grasshopper.
我记得他那时还很小。
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My grandmother always tells stories about me when I was knee-high to a grasshopper.
我奶奶总是讲我小时候的故事。