be knee-high to a grasshopper
informal humorousto be very small or young
Thesaurus: synonyms and related words
Extremely small
- atomized
- fractional
- infinitesimal
- irreducible
- itsy-bitsy
- Lilliputian
- micro
- microscopic
- miniature
- minuscule
- minute 1
- nano-
- slim
- subatomic
- tiddly
- tiny
- titchy
- vanishingly
- weeny
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Describing people who are young