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A window of opportunity a free or suitable interval or period of time for a particular event or action; the expression was first used in connection with the US–Soviet arms race in the early 1980s.

window of vulnerability an opportunity to attack something that is at risk (especially as a cold war claim that America's land-based missiles were easy targets for a Soviet first strike).

window tax a tax on windows or similar openings that was imposed in the UK in 1695 and abolished in 1851; while it was in force, a number of windows in larger houses were bricked up to escape the tax.

See also the eyes are the windows of the soul, when poverty comes in at the door, love flies out of the window.

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