Ship's bells; the strokes on a ship's bell, every half hour, to mark the passage of time.(noun)
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Use "bells" in a sentence
"She says the department has decided to forego what she called bells and whistles like mobile detection machines, but she could not tell me how many machines ultimately the department will buy -- Lou."
"Ben and Tom credit producer Gil Norton with reigning in their pension to over-indulge in what they call the bells and whistles."
"The clanging of the bells is another curious circumstance."