mackle

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A blurred or double impression in printing.
• intransitive verb To blur or double (a printed impression).
• intransitive verb To become blurred.

from The Century Dictionary.

• noun A spot; specifically, in printing, a blemish in press-work made by a double impression, or by slipping or scraping, or by a wrinkle in the paper. Also macle, macule.
• To spot; maculate; blur; especially, in printing, to make a slipped, blurred, or double impression of. Also macule.

from the GNU version of the Collaborative International Dictionary of English.

• noun Same as macule.
• verb To blur, or be blurred, in printing, as if there were a double impression.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun obsolete A blurred or double impression in printing.
• verb obsolete To blur, or be blurred, in printing, as if there were a double impression.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a printed impression that is blurred or doubled