yeasayer

[yey-sey-er]
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noun

a person with an optimistic and confident outlook.
a person who habitually agrees with or is submissive to others.

Origin of yeasayer

First recorded in 1915–20; yea1 + (nay)sayer
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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