History of words and phrases
Make the grade: Grade in this phrase means an incline or slope and one who "makes the grade" has reached the highest point and reached his goal.
God bless you!: Goes back to the plague years of the Middle Ages, when a person's sneezes were thought to be signs that he was catching the dreaded plague.
Derriere: French for "in back of" or "behind." A euphemism for backside, buttocks or rump.