Douglas Harper's Etymology Dictionary
show-and-tell
elementary school teaching tool, 1948, American English.
Wiktionary
show-and-tell
n. (alternative form of show and tell English)
Usage examples of "show-and-tell".
I'm bringing the cocker spaniel puppies I told her about for show-and-tell.
Normally Kyle and Archer wouldn’t have bothered attending this kind of show-and-tell in the name of charity and social climbing, but not much had been normal since Archer had received a call from the government.
She pulled up one of the old Suzy Wong bamboo cocktail bar stools left over from the basement renovation, put aside her usual lack of enthusiasm for his model trains, and talked to Dad about them, like it was show-and-tell time.