I came across this expression while reading Dickens's American Notes. In context it seems to mean something similar to "all-purpose" or "catch-all," and seems to appear most in English/Welsh writing from the mid-19th century. It's new to me.
There are few words which perform such various duties as this word ’fix.’ It is the Caleb Quotem of the American vocabulary. You call upon a gentleman in a country town, and his help informs you that he is ‘fixing himself’ just now, but will be down directly: by which you are to understand that he is dressing. You inquire, on board a steamboat, of a fellow-passenger, whether breakfast will be ready soon, and he tells you he should think so, for when he was last below, they were ‘fixing the tables:’ in other words, laying the cloth. You beg a porter to collect your luggage, and he entreats you not to be uneasy, for he’ll ‘fix it presently:’ and if you complain of indisposition, you are advised to have recourse to Doctor So-and-so, who will ‘fix you’ in no time.
Can anybody here shed some light on the origins and meaning of this expression?