HSK10+
xī
weep or sob
Phonosemantic compound. 口 represents the meaning and 希 represents the sound.
口 Meaning component
kǒu
mouth
希 Sound component
hope
Seal script
Regular script
唏
weep or sob; grieve; sound of sobbing
唏嘘
to sob
sound of sobbing
唏哩哗啦
(onom.) clatter (of mahjong tiles etc)
Academia Sinica
Make Me a Hanzi
Unicode
Dong Chinese
CC-CEDICT
SUBTLEX-CH
MTSU Chinese text computing