leverage (n.) Look up leverage at Dictionary.com
1724, "action of a lever," from lever (n.) + -age. Meaning "power or force of a lever" is from 1827; figurative sense "advantage for accomplishing a purpose" is from 1858. The financial sense is attested by 1933, American English; as a verb in the financial sense by 1956. Related: Leveraged; leverages; leveraging.