Meaning of “boss” - Learner’s Dictionary

boss

noun [ C ] us uk /bɒs/
Extra Examples
She's been having a lot of trouble with her boss recently.My boss is always checking up on me.My boss is very sympathetic about my situation.My current boss gives me much more freedom.It took guts to stand up and tell the boss how she felt.

A2 someone who is responsible for employees and tells them what to do:

I'll ask my boss if I can leave work early tomorrow.

(Definition of “boss noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)