coattail noun 2verb 1forms 3 noun2 •The flap at the back of a coat that hangs down, sometimes below the waist. •[usually plural] (figurative) Success of a figure, organization or movement that transfers to those who associate with it.Mr Obama’s coat-tails may help lift Wall-Street-basher Elizabeth Warren past pickup-driving Everyman and one-time nude pin-up Scott Brown in Massachusetts[…]. — 2012 verb1 •To ride the coattails of. formscoattailed · coattailing · coattails