If children grow into clothes, they gradually become big enough to wear them.
To grow out of sth
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If children grow out of clothes, they become too big to fit into them.
To grow out of sth meaning & definition 1 of To grow out of sth.
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If you grow out of an interest or way of behaving, you stop having or doing it as you become older:
To grow out of sth meaning & definition 2 of To grow out of sth.
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