verb - to choose or identify one person or thing from a group for special attention, treatment, praise, or criticism
verb, British English - to remove limescale or other mineral deposits from a kettle, coffee machine, pipe, or another appliance or surface
noun - the movement of people or animals from one place to another, often for work, safety, or better living conditions
noun - the process by which information becomes increasingly inaccurate or distorted as it is passed from one person to another