• A rule of thumb is a general principle developed through experiential rather than scientific means.

  • A principle that comes from the wisdom of experience, usually but not always valid.

  • A rough, practical method of procedure.

1. In fashion, the rule of thumb is that you don’t wear white after Labor Day.


2. A good rule of thumb is not to purchase a car you can’t pay back within three years.


3. On dates, the rule of thumb is that the man should pay for dinner on the first date.


4. Here’s a rule of thumb when you’re buying a home, you should put 50% of your income towards housing and bills.

criterion, hit and miss, pragmatism, rules, tips, trial and error, unwritten rule

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