smoke screen
- a cloud of smoke spread to screen the movements of troops, ships, etc.
- anything said or done to conceal or mislead
See smoke screen in American Heritage Dictionary 4
or smoke·screen (smōkˈskrēnˌ)
noun- A mass of dense artificial smoke used to conceal military areas or operations from an enemy.
- An action or statement used to conceal actual plans or intentions.
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