boast    kwīmānya, kwīrāta
(of what one will do) kwigenera
(over another) kudigiriza
En-En dictionary 
kwīgenera (-īgeneye)     v    1. to do something of oneself without authority, 2. boast of what one will do, 3. to attribute to oneself
kudigiriza (-digirije)     v    1. to threaten, 2. to frighten, 3. to boast over another
kwīmānya (-īmānye)     v    1. to boast, be proud, 2. to split in two (vi)
kwīrāta (-īrāse)     v    to glory in, to boast, to tell how one's affairs are going