FIFTH WHEEL
\fˈɪfθ wˈiːl], \fˈɪfθ wˈiːl], \f_ˈɪ_f_θ w_ˈiː_l]\
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more than is needed, desired, or required; "trying to lose excess weight"; "found some extra change lying on the dresser"; "yet another book on heraldry might be thought redundant"; "skills made redundant by technological advance"; "sleeping in the spare room"; "supernumerary ornamentation"; "it was supererogatory of her to gloat"; "delete superfluous (or unnecessary) words"; "extra ribs as well as other supernumerary internal parts"; "surplus cheese distributed to the needy"
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an extra car wheel and tire for a four-wheel vehicle
By Princeton University
