cheerer-upper

[ cheer-er-uhp-er ]
/ ˌtʃɪər ərˈʌp ər /

noun Informal.

a person or thing that cheers a person up: A good joke is the best cheerer-upper.

Origin of cheerer-upper

cheer up + -er1, joined pleonastically to both v. and particle
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019