”12blockquote 10"utter" means "speak". This is bad advise, by the way. You need to speak the language to become comfortable with it even if you are not proficient.
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01cite10Desireandlove12cite10sufficient input12blockquote10I would say "sufficient exposure to English." It just means hearing/reading enough English to become accustomed to and confident with the language.01blockquote
01cite10Desireandlove12cite10enough 11b10input12