to the best of one's knowledgeidiom
Definition of to the best of one's knowledge
1 —used to say that a person thinks something is true but that there may be something he or she does not know which makes it untrue To the best of his knowledge, no one had called all morning.
2 : as truthfully as possible I answered their questions to the best of my knowledge.
required by fashion, etiquette, or custom
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