do's and don'ts

do's and don'ts idiom
Rules or customs concerning some activity, as in It's important to know the do's and don'ts of diplomatic receptions. This expression alludes to what one should and should not do or say. [c. 1900]

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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