That cannot be licked; especially that cannot be beaten or defeated.
Mid 19th century; earliest use found in Benjamin Disraeli (1804–1881), prime minister and novelist. From un- + lick + -able.
英语词典包含464360条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。