Cleverness and education can be gained only by effort.

Archaic form of quartermaster.

plural of quarter-master

(idiomatic) To take orders from two superiors or two conflicting parties.

plural of MasterCard

(banking) A credit card issued by the credit card company MasterCard.

plural of posture-master

(archaic) One who teaches or practices artificial postures of the body: an acrobat.

Alternative form of workmaster

plural of work-master