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Phonetics
noun
An unaccented beat at the start of a musical phrase.
Example: The conductor said: I give you three beats for nothing and then you come in on the upbeat.adjective
Having a fast pace, tempo, or beat.
Example: The notes are easy, but it's an upbeat tune and should be played fairly quickly.Having a positive, lively, or perky tone, attitude, etc.
Example: He sounded upbeat when I talked to him.