to bear something in mind
to remember something important
food for thought
something that makes you think about something deeply
slip my mind
to forget something
lose your train of thought
to forget what you were saying because of an interruption
miles away
unaware of what is happening or what someone is saying
a memory like a sieve
a really bad memory
in one ear and out the next
to not remember something, to not pay attention to something
off the top of your head
not a carefully considered opinion often because of a lack of time to check the accuracy of the information
a trip down memory lane
when people think about and remember things from the past
to jog someone's memory
to help someone remember something
to rack your brain
to try very hard to remember something
a senior moment
to have a lapse in memory, usually unexpectedly
a blast from the past
a person or thing that reminds you of an earlier time in the past
off by heart / by heart
learned in a way that you can repeat it by memory without help
on the tip of my tongue
a word or name that you can almost remember but not quite - it's just out of reach
