be green around the gills
US /bi ɡriːn əˈraʊnd ðə ɡɪlz/
UK /bi ɡriːn əˈraʊnd ðə ɡɪlz/

1.
脸色发青, 看起来不舒服
to look ill or nauseous
:
•
After the roller coaster ride, he was green around the gills.
坐完过山车后,他脸色发青。
•
She looked a bit green around the gills after eating that questionable seafood.
吃了那些可疑的海鲜后,她脸色有点发青。