bird dog

Etymology
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Noun

 * 1) A dog, especially a pointer, used in shooting to retrieve the dead birds.
 * 2) A tout.
 * 3) A person who seeks out real estate investment opportunities in exchange for a fee.
 * 4)  A radar detector (for detecting police speed traps).
 * 5) A hyperextension exercise performed lying on the knees, with one arm and the opposite leg lifted.
 * 6) A person who tries to steal someone else's romantic partner
 * 1) A person who tries to steal someone else's romantic partner

Verb

 * 1)  To watch closely.
 * 2)  To seek out.
 * 3)  A  requesting configuration of sensors.