barn door noun 5verb 1forms 3 noun5 •The large door of a barn. •(humorous) Something large enough that a miss ought to be impossible.Buying a barn door won't help your tennis game. •(humorous, euphemistic) The groin area of a pair of pants, especially in reference to a fly.Somebody forgot to close his barn door again! •A player who blocks every ball. •An off-balance pivot on two points of contact. verb1 •To apply or adjust the barn doors as part of lighting.These backlights are placed in the ideal position, directly in line with each cross camera lens, barn doored to light only the back of the participants. — 2012 formsbarn doored · barn dooring · barn doors