(1):

(v. t.) To make dull- or sad-colored, as cloth.

(2):

(v. t.) To make grave or serious; to make melancholy or sorrowful.

(3):

(v. t.) To make sad.

(4):

(v. t.) To render heavy or cohesive.

(5):

(v. i.) To become, or be made, sad.