gufurungana (-furunganye)     v    to turn bad suddenly (weather, person's attitude, etc.)
attitude    ukugira iciyumviro
(to turn bad suddenly) gufurungana
En-En dictionary 
turn    urubu
(to take) kuja imbu, kwākīrana, kwākīranwa, gukūranwa
(to have one's) kuramukirwa
(about, vt) kuzūnguza, kuzūnguriza
(against) guhinyura
(against one you've loved) gucāna
(around, vi) guhindukira
(around, vt) guhindukiza
(around several times, vt) kuzungagiza
(away, vt) guhīnda
(back, vt) gukuba
(as fold)
(bad suddenly, e.g. weather, attitude) gufurūngana, gufurāngana
(on side, vt) guhēngeka
(one's head) gukebuka
(over and over, vt) kugaragura
(right side up) gucurūra
(upside down) kwūbika, gucuramika
(upside down or wrong end to) gucurika
En-En dictionary 
weather    (severe cold) igikonyozi
(cloudy but not rainy) urufuri
(to be cool) gupfuka
(to turn bad suddenly) gufurūngana
En-En dictionary