| Idiom | Meaning | Example | 
| don't look a gift horse in the mouth | 
do not complain if a gift is not perfect; take what you've been given without criticism or emphasis on its worth.
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Be happy. Don't look a gift horse in the mouth.
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| don't put all your eggs in one basket | 
do not invest all the money in one company
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Balance your investments. Don't put all your eggs in one basket.
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| don't rock the boat | 
do not cause a change, do not upset anybody
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If the team is winning, don't rock the boat. Don't change anything.
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| don't sweat it | 
do not worry about it, you can't saw sawdust
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If you did your best but didn't win a medal, don't sweat it.
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| don't teach your grandmother how to suck eggs | 
do not tell me what I know, do not say what is obvious
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You, a history major, telling me, a war veteran, about war? Don't teach your grandmother how to suck eggs!
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| don't think so | 
do not believe it is so, think not
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"Do you have dandruff?" "I don't think so."
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| don't want to go there | 
do not want to talk about it, it is not a pleasant topic
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My divorce? We don't want to go there. It's ugly!
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| done for | 
defeated, beaten, hopeless
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We were done for until Tim hit a home run and we won the game.
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| done good | 
did well, performed well, did good
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After watching the race, his dad   said, "You done good, Son."
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| done in | 
very tired, dead tired, all in
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After the roundup, the old-timer was done in - exhausted.
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| done it all | 
had a lot of experience, done every activity
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We need a manager who's done  it all - done all the jobs.
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