shaking    igishītsi
En-En dictionary 
igishītsi (ibi-)     4  class 4
singular: iki-,ic-
plural: ibi-,ivy-
  
1. big earthquake, 2. shaking, trembling
umushītsi (imi-  2  class 2
singular: umu-
plural: imi-
  
1. big earthquake, 2. shaking, trembling