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1.
to not tell sb sth they want or need to know :
to hold back information
2.
to stop yourself from expressing how you really feel :
She just managed to hold back her anger.
He bravely held back his tears.
HOLD STH
Meaning of HOLD STH in English
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005