smudge

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

• intransitive verb To make dirty, especially in one small area.
• intransitive verb To smear or blur (something).
• intransitive verb To fill (an orchard or an inhabited area) with dense smoke from a smudge pot in order to prevent damage from frost or to repel insects.
• intransitive verb To smear something, such as dirt or soot.
• intransitive verb To become smudged or blurred.
• noun A blotch or smear.
• noun A blurry or indistinct part or image.
• noun A smoky fire used to protect against frost or to repel insects.

from The Century Dictionary.

• To smear or stain with dirt or filth; blacken with smoke.
• To smoke or cure, as herring.
• noun A spot; stain; smear.
• noun The scrapings and cleanings of paint-pots, collected and used to cover the outer sides of roof-boards as a bed for roofing-canvas.
• To stifle; smother.
• To make a smudge in; fumigate with a smudge: as, to smudge a tent so as to drive away insects.
• noun In the game of set-back all-fours, the player who bids 4 and makes it, winning the came on the hand if he is not in the hole on the score at the time.
• noun A suffocating smoke.
• noun A heap of combustibles partially ignited and emitting a dense smoke; especially, such a fire made in or near a house, tent, or the like, so as to raise a dense smoke to repel insects.

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

• transitive verb To stifle or smother with smoke; to smoke by means of a smudge.
• transitive verb To smear; to smutch; to soil; to blacken with smoke.
• noun A suffocating smoke.
• noun United States A heap of damp combustibles partially ignited and burning slowly, placed on the windward side of a house, tent, or the like, in order, by the thick smoke, to keep off mosquitoes or other insects.
• noun That which is smeared upon anything; a stain; a blot; a smutch; a smear.

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

• noun A blemish; a smear.
• noun Dense smoke, such as that used for fumigation.
• verb To obscure by blurring; to smear.
• verb To soil or smear with dirt.
• verb To use dense smoke to protect from insects.
• verb To stifle or smother with smoke.
• verb paganism To burn herbs as a cleansing ritual.

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

• verb make a smudge on; soil by smudging
• noun a blemish made by dirt
• noun a smoky fire to drive away insects