safety catch
noun [ C ] uk/ˈseɪf.ti ˌkætʃ/ us/ˈseɪf.ti ˌkætʃ/
(枪炮的)保险机,保险栓;(机器的)保险掣子
a small part on something dangerous, especially a machine or a gun, that prevents people from using it without intending to
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