The difference between Blah and Eyewash
When used as nouns, blah means nonsense, whereas eyewash means a soothing medicated lotion for the eyes.
When used as verbs, blah means to utter idle, meaningless talk, whereas eyewash means to fool with nonsense or flattery.
Blah is also interjection with the meaning: an expression of mild frustration.
Blah is also adjective with the meaning: dull.
check bellow for the other definitions of Blah and Eyewash
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Blah as a noun (uncountable, informal):
Nonsense; drivel; idle, meaningless talk.
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Blah as a noun (informal):
(in plural, the blahs) A general or ambiguous feeling of discomfort, dissatisfaction, uneasiness, boredom, mild depression, etc.
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Blah as an adjective (informal):
Dull; uninteresting; insipid.
Examples:
"Well, the new restaurant seems nice, but their menu is a little blah."
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Blah as an adjective (informal):
Low in spirit or health; down.
Examples:
"I decided to go exercise rather than sit around all day feeling blah."
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Blah as a verb (intransitive):
To utter idle, meaningless talk.
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Eyewash as a noun (countable, uncountable):
A soothing medicated lotion for the eyes
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Eyewash as a noun (uncountable, slang):
Nonsense; flattery; pretentiousness.
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Eyewash as a verb:
To fool with nonsense or flattery.
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Eyewash as a verb (intelligence):
To keep information secret by sending false information to many people in one's own organization, and correct information to a select few.