American Heritage Dictionary
(8)
Century Dictionary
(8)
GNU Webster's 1913
(4)
WordNet
(3)
Elsewhere on the web
Some users have been able to muffle the sound a bit by pressing slightly on the casing of the computer, which indicates that this a mechanical problem.— MacFixIt
RALLY MODE: Palin's popularity seems to muffle harsh criticism.— Anchorage Daily News - Alaska News
A 2.4 liter four-cylinder in a Lexus is also a world first, but those worried about noise, vibration, and harshness should know that Lexus surely did - and that the car probably has enough dampers, insulation, and seals to muffle five screaming babies.— Boston.com Most Popular

American Heritage Dictionary (2)
Century Dictionary (3)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word a few times a year.
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