What does Boxing Day have to do with boxing?
late 14c., from Old French usuel (late 13c.), from Late Latin usualis "ordinary," from Latin usus "custom" (see use). The usual suspects is from a line delivered by Claude Rains (as a French police inspector) in "Casablanca" (1942).
A person who uses narcotics, esp an addict (1950s+ Narcotics)