εὐφραίνω

[in LXX chiefly for שָׂמַח, qal, pi. ;]

to cheer, gladden: with accusative of person(s), opposite to λυπεῖν, 2Co.2:2. Pass. to be happy, rejoice, make merry: Luk.15:32, Act.2:26" (LXX) Rom.15:10 (LXX), Gal.4:27 (LXX), Rev.11:10 12:12; before ἐν, Act.7:41; ἐπί with dative, Rev.18:20; of merry-making at a feast (3Ki.4:20; of. Kennedy, Sources, 155; Field, Notes, 69 f.), Luk.12:19 15:23-24, 29" (LXX) (λαμπρῶς) Luk.16:19.†

(AS)

to cheer, gladden; to be happy, rejoice, make merry