Emily Dickinson Lexicon

SAG, v.i. [a different spelling of swag, – which see.]

1. To yield; to give way; to lean or incline from an upright position, or to bend from a horizontal position. Our workmen say, a building sags to the north or south; or a beam sags by means of its weight.
2. In sailing, to incline to the leeward; to make lee way. – Mar. Dict.