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If one's memory serve somebody (right)
if {one's} memory [serve] correctly
if one's memory serve somebody (right)
01
если мне не изменяет память
used when one is trying to remember something, but is not sure whether one can remember it correctly
Collocation
Пример
If my memory serves me, we met her at a conference last year.
I think the meeting is at 2:00 PM, if my memory serves me right.
I think the meeting is at 2:00 PM, if my memory serves me right.