欠

qian

to owe, to lack; yawn

a person opening his mouth wide to yawn

口

kou

吹

chui

blow

mouth (kou) + yawn (qian)

to blow 'smoke circles' by opening a mouth as yawning

冫

bing

次

ci

next; secondary

ice (bing) + owe/lack (qian)

ice is lacking fluidity (the 3rd stroke); that's why its water's next (2ndary) state 

哥

ge

歌

ge 

song; to sing

brother (ge) + yawn (qian)

又

you

again

hand

欢

huan

joyful; joyous

hand/again (you) + yawn (qian)

again and again mouth is wide open and hands are clapping because one is feeling continuously joyful