This is the 16098th most frequent Polish word.
ucieszy
"Ucieszy" means "(he/she/it) will cheer up" or "(he/she/it) will bring joy."
Here 'ucieszy' is used in its figurative meaning to describe providing comfort or alleviation.
Ucyszy ci troski i zmartwienia.
It will ease your worries and concerns.
In this sentence, 'ucieszy' means to bring happiness or delight to someone.
Możemy być pewni, że ten koncert ucieszy publiczność.
We can be sure that this concert will delight the audience.
'Ucyszy' in this context is expressing causing happiness or pleasure.