sag

American Heritage® Dictionary of the English Language, Fourth Edition

1. v. To sink, droop, or settle from pressure or weight.
2. v. To lose vigor, firmness, or resilience: My spirits sagged after I had been rejected for the job.
3. v. To decline, as in value or price: Stock prices sagged after a short rally.
4. v. Nautical To drift to leeward.
5. v. To cause to sag.
6. n. The act or an instance of sagging.
7. n. The degree or extent to which something sags.
8. n. A sagging area; a depression.
9. n. A temporary decline in monetary value.
10. n. Nautical A drift to leeward.

Century Dictionary and Cyclopedia

1. To droop, especially in the middle; settle or sink through weakness or lack of support.
2. Hence To yield under the pressure of care, difficulties, trouble, doubt, or the like; be depressed.
3. To go about in a careless, slovenly manner or state; slouch.
4. Nautical, to incline to the leeward; make lee-way.
5. To cause to droop or bend in the middle, as by an excessive load or burden: opposed to hog.
6. n. A bending or drooping, as of a rope that is fastened at its extremities, or of a surface; droop. Specifically— The dip of a telegraph-wire, or the distance from the straight line joining the points to which the wire is attached to the lowest point of the arc it forms between them.
7. Heavy; loaded; weighed down.
8. n. In railroad construction, a depression in the grade of a road; the meeting of a down grade with an up grade. An abrupt sag is objectionable, owing to the varying strains upon the cars of a train passing it, the cars on the up grade being pulled apart and those on the down grade being pressed together, the strains being reversed as each car passes the lowest point of the sag.
9. n. A depression in a crest-line or divide.

Wiktionary

1. n. The state of sinking or bending; sagging.
2. n. The difference in elevation of a wire, cable, chain or rope suspended between two consecutive points.
3. n. The difference height or depth between the vertex and the rim of a curved surface, specifically used for optical elements such as a mirror or lens.
4. v. 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.
5. v. figuratively To lose firmness, elasticity, vigor, or a thriving state; 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.
6. v. To loiter in walking; to idle along; to drag or droop heavily.
7. v. transitive To cause to bend or give way; to load.
8. v. informal To wear one's trousers so that their top is well below the waist.

GNU Webster's 1913

1. v. To sink, in the middle, by its weight or under applied pressure, below a horizontal line or plane; ; hence, to lean, give way, or settle from a vertical position.
2. v. rare 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.
3. v. To loiter in walking; to idle along; to drag or droop heavily.
4. v. To cause to bend or give way; to load.
5. n. State of sinking or bending; sagging.

WordNet 3.0

1. v. cause to sag
2. n. a shape that sags
3. v. droop, sink, or settle from or as if from pressure or loss of tautness