This
database is a comprehensive collection of all the American idioms and slang available.
American Idioms are many and varied. We hope you enjoy our collection. We are adding more all the time.
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Good night, sleep tight. Before box springs were in use, old bed frames used rope pulled tightly between the frame rails to support a mattress. If the rope became loose, the mattress would sag making for uncomfortable sleeping. Tightening the ropes would help one get a good night sleep.