What does drop a coin in the slot mean?

: Crypto Casino Games & Casino Slot Games coin slot meaning Coin-slot definition: An small opening on a vending machine, arcade game machine, parking meter, etc to insert payment and operate the mechanism coin slot machines for sale The meaning of SLOT MACHINE is a machine whose operation is begun by dropping a coin into a slot

coin slot 303 a long, narrow notch or opening into which something may be put The mail goes in this coin slot on the parking meter was jammed