HSK10+
shǔn
suck with mouth
Phonosemantic compound. 口 represents the meaning and 允 represents the sound.
口 Meaning component
kǒu
mouth
允 Sound component
yǔn
allow, permit
Seal script
Regular script
吮
suck with mouth, sip, lick; to suck
to suck
吸吮
to suck in
吮吸
Academia Sinica
Make Me a Hanzi
Unicode
Dong Chinese
CC-CEDICT
SUBTLEX-CH
MTSU Chinese text computing