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do's and don'ts

The general rules and regulations of a given activity, operation, or situation. Before you begin your first day working for us, there are a few important do's and don'ts that I need to familiarize you with. Tom doesn't understand the basic do's and don'ts of social etiquette.
See also: and

be damned if you do and damned if you don't

To be in a situation in which every action (or inaction) could potentially cause one trouble. So your boss will be mad if you miss the work event, and your husband will be disappointed if you skip your anniversary dinner. Yep, you're damned if you do and damned if you don't!
See also: and, damned, if

if it ain't broke, don't fix it

If something is going well, there's no need to change it. A: "We don't really need to implement these ridiculous changes, do we? Our current method is working just fine." B: "Well, if it ain't broke, don't fix it."
See also: fix, if

do's and don'ts

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]
See also: and

if it ain't broke, don't fix it

INFORMAL
COMMON You say if it ain't broke, don't fix it to mean that things should only be changed if there are problems with them. With regard to proposals for some grand reorganization of the intelligence community: If it ain't broke, don't fix it. And I believe it is not broke. Note: You can also say isn't broken instead of ain't broke and why fix it? instead of don't fix it. Her outlook is `If it isn't broken, why fix it?' She puts up with a lot I wouldn't tolerate. Note: The word `ain't' is a form of `isn't' which is used in informal or non-standard English. The first recorded use of this modern proverb is by the American Bert Lance, President Carter's Director of the Office of Management and Budget (1977). He was referring to governmental reorganization.
See also: fix, if

be damned if you do and damned if you don't

When people say that you will be damned if you do and damned if you don't, they mean that whatever you choose to do in a situation, you will be criticized. When it comes to interfering in other countries, when you're the world's most powerful nation, you're damned if you do and damned if you don't.
See also: and, damned, if

if it ain’t ˈbroke, don’t ˈfix it

used to say that if something is satisfactory and works well, it should not be changed: Why do they keep suggesting ‘improvements’ when everything’s working perfectly? If it ain’t broke, don’t fix it.
See also: fix, if

do’s and ˈdon’ts

(informal) what to do and what not to do; rules: This book is a useful guide to the do’s and don’ts of choosing and buying your first car.
See also: and