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slipstream

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slipstream/ˈslɪpˌstriːm/noun
pluralslipstreams
slipstream
/ˈslɪpˌstriːm/
noun
pluralslipstreams
Learner's definition of SLIPSTREAM  
[count]technical
: an area of low air pressure that is immediately behind a vehicle that is moving very fast and that other vehicles can ride in to go faster with less effort
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