to (the best of) your knowledge
idiomPart ofknowledge
to (the best of) your knowledge — idiom
1. used when saying that you believe something is true based on what you know, but
1.idiom
Definition
used when saying that you believe something is true based on what you know, but you are not completely certain because there may be facts you do not have
Example
To the best of my knowledge, the last train to Taipei leaves at 11:30 p.m.
No one has reported the missing key to the office, to my knowledge.