for all (one) knows

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for all (one) knows

Said when one is uncertain or has limited details about something. I haven't talked to Marie in weeks, so for all I know, she's not even coming to the dinner party tonight.
See also: all, know

for all I know

according to the information I have; I think; probably. (Usually implies uncertainty.) For all I know, the mayor has resigned already. She may have gone to town for all I know.
See also: all, know

for all I know

phr. as far as I know; I really don’t know. She came in late because she had an accident, for all I know.
See also: all, know