Information about a movie, book, or show that reveals surprises before someone sees it; also devices on cars that reduce wind resistance.
From 'spoil' (to ruin) plus '-er' suffix. Applied to plot revelations in the internet age (1990s+), while 'spoiler' (aerodynamic device) has been automotive since the 1960s.
The word 'spoiler' shifted meanings perfectly for the internet age—car spoilers literally 'spoil' airflow to control a vehicle, and plot spoilers 'spoil' the surprise a viewer wants.
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