Coin drop is a game in which coins are dropped into a SLOT and the player must guess which SLOT the coin will land in. The term 'coin drop' is derived from the fact that the coins are literally dropped into the slots. The crossword solutions for the term 'coin drop' are SLOT, which is a four-letter word. SLOT is a noun that refers to a narrow opening or groove, such as the one used in the game of coin drop.