(1):

(v. i.) To think and act in a confused, aimless way.

(2):

(v. t.) To cloud or stupefy; to render stupid with liquor; to intoxicate partially.

(3):

(v. t.) To make turbid, or muddy, as water.

(4):

(v. t.) To waste or misuse, as one does who is stupid or intoxicated.

(5):

(n.) A state of being turbid or confused; hence, intellectual cloudiness or dullness.

(6):

(v. t.) To mix confusedly; to confuse; to make a mess of; as, to muddle matters; also, to perplex; to mystify.

(7):

(v. i.) To dabble in mud.