Mar, v. t. [imp. & p. p. Marred p. pr. & vb. n. Marring.]
1. To make defective; to do injury to, esp. by cutting off or defacing a part; to impair; to disfigure; to deface.
I pray you mar no more trees with wiring love songs in their barks. --Shak.
But mirth is marred, and the good cheer is lost. --Dryden.
Ire, envy, and despair
Which marred all his borrowed visage. --Milton.
2. To spoil; to ruin. “It makes us, or it mars us.” “Striving to mend, to mar the subject.”