Why was clemency trending last week?
c.1400, agent noun from use (v.). Of narcotics, from 1935; of computers, from 1967. User-friendly (1977) is said in some sources to have been coined by software designer Harlan Crowder as early as 1972.
To think; reason out one's actions: teaches a man to use his head and to do the best he can/ You certainly used the old bean (1828+)