Redirect the impulse: displacement versus projection
The anger belongs to the boss, but expressing it there is dangerous. Two defenses dispose of it differently. Choose one and follow the impulse: displacement keeps the anger yours but sends it to a safer target; projection keeps the target but disowns the anger, attributing it to someone else.
Build a triggered displaced aggression response
A trivial trigger from a substitute target lands on anger still left over from an earlier provocation. The displaced aggression is the response the trigger would warrant on its own (tit-for-tat) plus an amplification equal to the residual anger, which is half the initial provocation. Set both and watch the response climb above simple matching.
A badly provoked person (initial 8) cut off in traffic (trigger 1) responds at 5, five times the trigger; the identical trigger on a calm person (initial 0) draws a response of 1, exactly tit-for-tat. The whole gap is the residual anger the trigger amplifies.
See where displacement sits among the defenses
The Defense Mechanisms Rating Scales order the defenses from the least adaptive action level to the most adaptive high-adaptive level. The same anger at the boss is handled differently at each level. Step through them; displacement sits at the neurotic level, redirecting the impulse rather than discharging or disowning it, but short of channeling it adaptively.