A drop may be:

• a drop, unit of measure of volume
• a drop (or droplet) of liquid, such as raindrops causing a rainbow, or forming clouds or fog
• a drop or dropout in telecommunications, such as in losing a signal, or as in a wire dropped-down from a ceiling
• dropping out, drop out, quiting, not terminating a course, school or education
• a dropoff or drop-off, like a cliff or ledge , as in a "steep drop"; or a drop-off and pick-up point for passengers or freight
• a falling or decrease , such as the temperature or the price of a commodity going down quickly
• a drop, or a length-to-weight relation for baseball bats. It is the length in inches minus the weight in ounces. For instance, if a bat weighs 31 ounces, and has a drop of minus 11, it will be 20 inches in length.