1Strongly or suitably defended or protected.
2Of a secret, a confidence, etc.: not made widely known, closely guarded.
Mid 16th century (in an earlier sense). From well + guarded.
英汉双解词典包含464360条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。