"Er macht ein Gesicht wie drei Tage Regenwetter" = "he has [lit. he makes] a face like three days of rain". Meaning, he's sad :D
s, Gesicht, er = a face.
sie hat sein wahres Gesicht gezeigt = she showed her true face.
wahr = true
nicht waht? = isn't it?
wahren = to keep
er hat sein Gesicht gewahrt/verloren = he kept/lost his face.
verlieren = to lose
#German