BONUS
NOUNS
1719 ► BUNCE bonus; extra profit or gain; something to the good → sl.
1849 ► LAGNIAPPE a small bonus gratuity included with a purchase; anything extra thrown in for good measure → Amer. dial.
.M19 ► SKEWINGS bonuses, extras; any form of money, esp. when gained for nothing → sl.
1911 ► BOUNTITH a bonus; something given in reward for service, over and above wages → Sc. (Bk.)
1930 ► EGG IN YOUR BEER a bonus, something for nothing → US sl.
2000 ► LUNCH a bonus, a profit → sl.
VERBS
1905 ► BONIFY to give a bonus to
Lexicophilia 