hold back

动词

To act with reserve; to contain one's full measure or power. (intransitive) · Don't hold back. Hit it as hard as you can.
To contain; stop. (transitive) · The dam can't hold back that much water.· I was swallowing hard to hold back the tears.
To delay the progress of, especially in school. (transitive) · He's a year older than his classmates, because he was held back in second grade.

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Ask me what you like, and there is nothing which I shall hold back.

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