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
江苏热线英汉汉英双解词典包含207361条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。