show and tell definition
|a gadget; dingus; thingumbob.|
|an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.|
show and tell
A public presentation or display, as in It was a terrible bore, what with their show and tell of every last detail about their trip around the world. This expression originated in the 1940s to describe a learning exercise for young children, in which each child in a group brings some object to show the others and talks about it.