What is "sad bread"

Sad \Sad\ (s[a^]d), a. [Compar. Sadder (s[a^]d"d[~e]r); superl. Saddest.] [OE. sad sated, tired, satisfied, firm, steadfast, AS. s[ae]d satisfied, sated; akin to D. zat, OS. sad, G. satt, OHG. sat, Icel. sa[eth]r, saddr, Goth. sa[thorn]s, Lith. sotus, L. sat, satis, enough, satur sated, Gr. 'a`menai to satiate, 'a`dnh enough. Cf. Assets, Sate, Satiate, Satisfy, Satire.]

1. Sated; satisfied; weary; tired. [Obs.]

   Yet of that art they can not waxen sad, For unto them it is a bitter sweet.
   --Chaucer.

2. Heavy; weighty; ponderous; close; hard. [Obs., except in a few phrases; as, sad bread.]

   His hand, more sad than lump of lead.
   --Spenser.

   Chalky lands are naturally cold and sad.
   --Mortimer.

3. Dull; grave; dark; somber; -- said of colors. ``Sad-colored clothes.''
   --Walton.

   Woad, or wade, is used by the dyers to lay the foundation of all sad colors.
   --Mortimer.

4. Serious; grave; sober; steadfast; not light or frivolous. [Obs.] ``Ripe and sad courage.''
   --Chaucer.

   Lady Catharine, a sad and religious woman.
   --Bacon.

   Which treaty was wisely handled by sad and discrete counsel of both parties.
   --Ld. Berners.

5. Affected with grief or unhappiness; cast down with affliction; downcast; gloomy; mournful.

   First were we sad, fearing you would not come; Now sadder, that you come so unprovided.
   --Shak.

   The angelic guards ascended, mute and sad.
   --Milton.

6. Afflictive; calamitous; causing sorrow; as, a sad accident; a sad misfortune.

7. Hence, bad; naughty; troublesome; wicked. [Colloq.] ``Sad tipsy fellows, both of them.''
   --I. Taylor.

   Note: Sad is sometimes used in the formation of self-explaining compounds; as, sad-colored, sad-eyed, sad-hearted, sad-looking, and the like.

   Sad bread, heavy bread. [Scot. & Local, U.S.]
   --Bartlett.

   Syn: Sorrowful; mournful; gloomy; dejected; depressed; cheerless; downcast; sedate; serious; grave; grievous; afflictive; calamitous.