boss

Concise Oxford English Dictionary © 2008 Oxford University Press:
boss1 informal

▶noun a person who is in charge of an employee or organization. ▶verb (usu. boss someone about/around) give orders in a domineering manner. ▶adjective N. Amer. excellent.

– origin C19 (orig. US): from Du. baas ‘master’.

Concise Oxford English Dictionary © 2008 Oxford University Press:
boss2

▶noun

• 1 a stud on the centre of a shield.

• 2 Architecture an ornamental carving at the point where the ribs in a ceiling cross.

• 3 the centre of a propeller.

• 4 a large mass of igneous rock protruding through other strata.

– origin ME: from OFr. boce.