Fix has a basic meaning of "to place" and "to fasten securely," but it is overused in a variety of meanings only loosely related to establishing, securing, or repairing. As a noun, fix is used to refer to (1) a dilemma or predicament, (2) the position of a plane or ship, (3) bribery and collusion, and (4) an injection of heroin or some other opiate. These uses of fix are ranked as standard, informal, or slang by different dictionaries, but all are employed so widely that it seems useless to recommend against them. As a verb, fix has some thirty different meanings, most of which are vague, loose, and imprecise. Try to substitute a more exact word, because it doesn't make sense to use the same expression in such locutions as "fix a toy," "fix a drink," "get a fix," "fix your position at sea," "fix your face," "fix your hair," "fix a bet on a game," "fix an engagement," "fix a sentence," "fix a fight," and "be in a fix." Fixings is an informal word for "trimmings," "accessories": "turkey and all the fixings (or fixin's)."
Dictionary of problem words and expressions. Harry Shaw. 1975.