Ring a bell : To cause someone to remember something or for it to seem familiar.
Saved by the bell : Expression comes from boxing, where a boxer who is still on his feet but close to being knocked down can be saved from losing by the bell ringing to indicate the end of the round.
Did you know : A safety coffin or security coffin is a coffin fitted with a mechanism to prevent premature burial or allow the occupant to signal that they have been buried alive. A large number of designs for safety coffins were patented during the 18th and 19th centuries and variations on the idea are still available today.
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