good for

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good for (someone or something)

1. Having a positive effect on someone or something. More sunlight will be good for your drooping plants. Let's go to the playground. A bit or fresh air and exercise will be good for you!
2. Able to pay a debt owed. I'm good for the money, don't worry. I'll get it to you first thing tomorrow.
3. Able to work or function for some amount of time. I know it's a used car, but it ought to be good for a few more years.
4. Valid or in effect for some amount of time.. How long is this warranty good for? Is this coupon really good for 50% off our total purchase?
5. An expression of approval or support of someone for something they have done or accomplished. I heard you got the promotion—good for you! Good for him. Getting an A in that class is no easy feat.
See also: good
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

Good for you!

a complimentary expression of encouragement for something that someone has done or received. Sue: I just got a raise. Bill: Good for you! Jane: I really told him what I thought of his rotten behavior. Sue: Good for you! He needs it.
See also: good
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

good for

1. Beneficial to, as in Milk is good for children. [Tenth century a.d.]
2. Financially reliable, able to pay or repay, as in They know he's good for a big tip. [Mid-1800s]
3. Able to serve or continue to function, as in This furniture's good for at least ten more years, or I hope you're not tired-I'm good for another three miles or so. [Mid-1800s]
4. Equivalent in value; also, valid for. For example, These coupons are good for a 20 percent discount, or This contract is good for the entire life of the book. [Second half of 1800s]
5. good for someone. An expression of approval, as in Good for Bill-he's sold the car, or Good for you! You passed the exam. This usage differs from the others in that orally a slight emphasis is placed on you or whoever is being mentioned. [Mid-1800s]
See also: good
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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References in periodicals archive ?
Go do something good for someone without the intention of getting returns.
I recently read on the social media that it is not good for someone over the age of 50 to eat eggs.
To motivate ourselves to do something good for someone even if we don't feel like it.
"It would be really good for someone from senior management to stand up publicly and say 'We cannot cope with the cutbacks and the demand'.
I think it feels better to receive a 'Thank You!' It makes you feel somehow you did something good for someone else!
I just felt it would be good for someone like him, who's been at Celtic and has a terrific reputation, to come and compete with Derek.
Singer Katherine Jenkins, who is pregnant, posted: "I'm not sure all this excitement is good for someone in my condition!" There was no postmatch reaction from the Duke and Duchess of Cambridge, who supported Wales, or Prince Harry, who was backing England.
"He is ready now to help the group because, remember, he had to be an important player for his team, River Plate, in Montevideo and his goalscoring record is very good for someone of such a young age - and he knows how to be effective.
It's good for someone of his status to take the time to give his comments and help me out and I feel it can benefit me."
"It fosters a common bond between everyone of wanting to do something good for someone else."
Fairy stories have an enduring appeal for both children and adults, but it is always good for someone to add a new twist to the familiar format.
A [Olivier's] silly, a clown, and very much the life of the party, which is good for someone like me," Berry was quoted as saying in the November issue of InStyle.
For me, it was a good race overall and it was good for someone to push me and show that I still have it," The Telegraph quoted Bolt, as saying.
"It was pretty good for someone who has out for so long with a substantial injury," said Smith.