shellac
/ʃəˈlæk, also ˈʃelæk; ʃə`læk/ n[U]
resinous substance in the form of thin sheets or flakes, used in making varnish 虫胶; 紫（胶虫）胶. shellac, v (-ck-) [Tn]
1 varnish (sth) with shellac 给（某物）涂上虫胶清漆.
2 (US infml 口) defeat (sb) soundly or severely 彻底击败（某人）.