Cracker

noun

1. A dry, thin, crispy baked bread (usually salty or savoury, but sometimes sweet, as in the case of graham crackers and animal crackers).
2. A short piece of twisted string tied to the end of a whip that creates the distinctive sound when the whip is thrown or cracked.
3. A firecracker.
4. A person or thing that cracks, or that cracks a thing (e.g. whip cracker; nutcracker).
5. A Christmas cracker.