smokescreen

Từ điển Oxford Advanced Learner 8th

smoke·screen [smokescreen smokescreens] BrE [ˈsməʊkskriːn] NAmE [ˈsmoʊkskriːn] noun
1. something that you do or say in order to hide what you are really doing or intending
2. a cloud of smoke used to hide soldiers, ships, etc. during a battle