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Related to profit: net profit, profit margin

profit by something

 and profit from something 
1. Lit. to gain money from something. You will surely profit by investing in this stock. I know I will profit from this investment.
2. Fig. to learn from something. I am sure you will profit by your unpleasant experience. Yes, I will profit from my failure.
See also: profit

turn a profit

to earn a profit. The company plans to turn a profit two years from now.
See also: profit, turn

turn a profit

to earn more money than you spend He's been in business five years but has yet to turn a profit.
See also: profit, turn
References in classic literature ?
He confessed that he never made any profits out of his quarry, and this, in spite of the enormous volume of business that had been caused by the destruction of San Francisco by the big earthquake.
And your branch store absorbed the profits of the three small ones.
Then the business game is to make profits out of others, and to prevent others from making profits out of you.
Yes, that's it, except that we do not object to the others making profits so long as they are not extortionate.
By extortionate you mean large; yet you do not object to making large profits yourself?
So the Trust took your profits away from you," Ernest said, "and you’ve gone into politics in order to legislate the Trust out of existence and get the profits back?
You see the powerful interests rising and growing more powerful day by day; you feel their mailed hands descending upon your profits and taking a pinch here and a pinch there--the railroad trust, the oil trust, the steel trust, the coal trust; and you know that in the end they will destroy you, take away from you the last per cent of your little profits.
At the culprits of riches, with cold eyes and rank thoughts, who pick up profit out of all kinds of rubbish--at this rabble that stinketh to heaven,
And so we're founding a locksmiths' association, where all the production and profit and the chief instruments of production will be in common.
Of course, of course,' replied the undertaker; 'and if I don't get a profit upon this or that particular article, why, I make it up in the long-run, you see--he
Insignificant profits and sumptuous profits do not stand on the same footing.
Then, to raise money to reach England, I had to borrow from a man named Da Souza, and afterwards, in London, to start the Company, I had to make him my partner in the profits of the concession.
I thought that you might give me time," Nesbitt said, "and I'll pay you the rest off with the whole of my profits every year.
See that Hardwell is credited with a quarter share of the profits.
A man might be respected with only one of these advantages, but without either he was considered, except in very rare instances, as a vagabond and a slave, doomed to waste his powers for the profits of the chosen few