start on а) начинать работу над чем-л.; He's a very busy lawyer and has already started on another case; б) набрасываться на кого-л. со словами; Don't start on me! It's not my fault!...
vent 2. v. 3) давать выход (напр., чувству); изливать (злобу и т.п.) (upon - на кого-л.); It's wrong to vent your anger on the children, they were not at fault....