Idiom meaning, usage examples, facts
RULE OF THUMBa rough guide; an unwritten or customary rule based on experience or practice
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1. In this company there is no written rule about how long we can take for our lunch break, but the rule of thumb has been about one hour.
2. Sometimes it’s hard to know how you are supposed to address people you are meeting for the first time. A good rule of thumb is to be formal and wait until they invite you to call them by their first names. |
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