喜不自胜 (xǐ bù zì shèng) | Meaning: unable to contain one's joy (idiom) | Chinese Idiom with Pinyin & Origin

to be pleased beyond one's expectations (idiom) · overjoyed at the turn of events喜出望外xǐ chū wàng wài

overjoyed at unexpected good news (idiom)大喜过望dà xǐ guò wàng

to smile · to beam开颜kāi yán

cannot help laughing · unable to restrain a smile忍俊不禁rěn jùn bù jīn

unable to contain one's joy (idiom)