Definition: a support for the genitals worn by men engaging in strenuous exercise
Definition: a band (usually elastic) worn around the leg to hold up a stocking (or around the arm to hold up a sleeve)
Definition: a person who contributes to the fulfillment of a need or furtherance of an effort or purpose
Usage: my invaluable assistant; they hired additional help to finish the work
Definition: someone who supports or champions something
Definition: a person who backs a politician or a team etc.
Usage: all their supporters came out for the game; they are friends of the library