不胜之喜bù shèng zhī xǐ

be mightily (/truly)rejoiced; cannot restrain one’s joy
❍ 却见武松赢得蒋门神，～，团团拥定武松。(《水浒全传》359) But when they saw Wu Song had conquered Jiang The Gate God,they were mightily rejoiced and they encircled Wu song.
❍ 见说拿得黄文炳，宋江～，众好汉一齐心中大喜。(《水浒全传》512) When they heard it said Huang Wenbing was captured Song Jiang could not restrain his joy,and all the good fellows felt their hearts filled with joy.