Webster's Revised Unabridged Dictionary · 1913

Mar

Mar , noun

A small lake. See Mere. [Provincial English]

Mar (mard) , transitive verb

[Old English marren, merren, Anglo-Saxon merran, myrran (in comp.), to obstruct, impede, dissipate; akin to Old Saxon merrian, Old High German marrjan, merran; compare Dutch marren, meeren, to moor a ship, Icelandic merja to bruise, crush, and Gothic marzjan to offend. Compare Moor, v.]

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. — Shakespeare
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. — Shakespeare
Striving to mend, to mar the subject.

Mar , noun

A mark or blemish made by bruising, scratching, or the like; a disfigurement.