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Jill of all trades(, master of none)

A woman who is skilled in or adept at a wide variety of tasks or abilities (i.e., the female equivalent of "Jack of all trades"). If used with "master of none," it implies that while competent in a variety of things, she is not highly skilled in a particular one. I've had all sorts of different jobs through the years, so I consider myself quite a Jill of all trades! Mary just sort of floated between different interests after she left high school—a Jill of all trades, but master of none.
See also: all, jill, master, of

a Jill of all trades is a master of none

A woman who is somewhat skilled in or adept at a wide variety of tasks or abilities will not have the time or dedication to become truly masterful in any one thing. The female equivalent of the proverb "a Jack of all trades is a master of none." Mary just sort of floated between different interests after she left high school, but never really developed anything career-worthy. A Jill of all trades is a master of none, as they say.
See also: all, jill, master, none, of, trade

Master of the Universe

1. Literally, the supreme being; God. One must always keep in mind the designs and desires of the Master of the Universe if one wishes to enter into heaven in the afterlife.
2. By extension, an extremely powerful, successful, or wealthy person, especially someone working on Wall Street in the US financial sector. John liked to think of himself as a self-styled Master of the Universe after earning his first million playing the stock market.
See also: master, of, universe

jack of all trades, master of none

A person who is able to do many things but does not have a high amount of skill in any one area. A: "My brother can play several instruments, but none very well." B: "You know what they say—jack of all trades, master of none."
See also: all, jack, master, none, of

Fire is a good servant but a bad master.

Prov. You must be careful to use fire wisely and under control so that it will not hurt you. Don't play with the candle flames, children. Fire is a good servant but a bad master. At camp, we learned how to build and extinguish fires safely, since fire is a good servant but a bad master.
See also: bad, but, fire, good, master

jack of all trades is a master of none

Prov. If you are able to do a lot of things fairly well, you will not have time to learn to do one thing extremely well. Jill: I envy Bob; he can do so many things. He writes novels, paints pictures, makes sculptures, and even plays the dulcimer. Jane: It's true he does a lot of things, but he probably doesn't do them all terribly well. A jack of all trades is a master of none, you know.
See also: all, jack, master, none, of, trade

No man can serve two masters.

Prov. You cannot work for two different people, organizations, or purposes in good faith, because you will end up favoring one over the other. (Biblical.) Al tried going to school and working, both full-time, but soon discovered that he could not serve two masters.
See also: can, man, master, serve, two

*past master (at something)

Fig. someone proven extremely good or skillful at an activity. (*Typically: be ~; become ~.) Mary is a past master at cooking omelets. Pam is a past master at the art of complaining.
See also: master, past

your lord and master

  (humorous)
someone who you must obey because they have power over you I have to go and cook supper for my lord and master.
See also: and, lord, master

be your own master

to be able to live or work in the way that you want to, without anyone else controlling your actions The big advantage of working for yourself is that you can be your own master.
See also: master

past master

A person who is thoroughly experienced or exceptionally skilled in some activity or craft. For example, We're lucky to get Ella, because she's a past master at fundraising. This expression probably alludes to the original literal meaning, that is, one who formerly held the post of master in a lodge or other organization. Although past mistress was used for an exceptionally skilled woman in the mid-1800s, it is heard less often today, master serving for both sexes. [Mid-1800s]
See also: master, past