1 chief, supervisor, head, administrator, manager, foreman, superintendent, overseer; employer, director, proprietor, owner, Brit managing director, US president, Dialect himself, Colloq supremo, Brit governor, gov., gaffer, US super, leader, kingpin, big cheese, the man, Slang honcho, head or chief honcho, Mr Big, prex or prexy:
If you have to leave early, check with the boss. The company boss was interviewed on television last night.
2 supervise, head, manage, run, oversee, overlook, direct, control, superintend, command, take charge, be in charge:
Clive has been here only a year and he's already bossing a department.
3 domineer, push or shove around or about, dominate, order about, lord it over:
That slave-driver had better stop bossing me about or I'll quit!