Meaning of should

should

Pronunciation: (shood), [key]
— auxiliary v.
  1. pt. of
  2. (used to express condition): Were he to arrive, I should be pleased.
  3. must; ought (used to indicate duty, propriety, or expediency): You should not do that.
  4. would (used to make a statement less direct or blunt): I should think you would apologize.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.