a principle that is kept to
a guide that is based on practice rather than theory
a general principle that comes through experience and not any scientific means
a practical and approximate way
As a rule of thumb, I do not start a new project on Fridays.
A good rule of thumb is to add the ingredients when the water starts to boil.
During our boot camp in the jungle, we used to drink a glass of water every two hours as a rule of thumb.
Going by the rule of thumb, it would take two hours to compile the data in each of these files.
As a rule of thumb, we never went camping near water bodies during the rains.
A useful rule of thumb in serving food is that two handfuls make a portion.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.