Sag v. i. : To sink, in the middle, by its weight or under applied pressure, below a horizontal line or plane; as, a line or cable supported by its ends sags, though tightly drawn; the floor of a room sags; hence, to lean, give way, or settle from a vertical position; as, a building may sag one way or another; a door sags on its hinges.

Sag v. i. : Fig.: To lose firmness or elasticity; to sink; to droop; to flag; to bend; to yield, as the mind or spirits, under the pressure of care, trouble, doubt, or the like; to be unsettled or unbalanced.

Sag v. i. : To loiter in walking; to idle along; to drag or droop heavily.

Sag v. t. : To cause to bend or give way; to load.

Sag n. : State of sinking or bending; sagging.

Example:
How does one become a Sag member?

Taxonomy
Screen Actors Guild, SAG, Script to Screen, Austin, Conservatory, the Conservatory, Shady Creek, Wire, talent, What's Next, American Indian, SAG Foundation, SAG Awards, Los Angeles, affiliated distributors, McMahan, Conservatory program, the Musicians.

Defination from the web:
Official site for the labor union representing actors in film, television, industrials, commercials, and music videos.