Safety chain
noun
1.
a chain on the fastening of a bracelet, watch, etc, to ensure that it cannot open enough to fall off accidentally Also called guard
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[seyf-tee-di-poz-it] /ˈseɪf ti dɪˌpɒz ɪt/ adjective 1. safe-deposit.
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noun 1. safe-deposit box. safe-deposit box or safety-deposit box noun 1. a lockable metal box or drawer, especially in a bank vault, used for safely storing valuable papers, jewelry, etc.