rule of thumb

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Definition of RULE OF THUMB

1

:  a method of procedure based on experience and common sense

2

:  a general principle regarded as roughly correct but not intended to be scientifically accurate

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First Known Use of RULE OF THUMB

1692

Rhymes with RULE OF THUMB

apart from, aside from, beat the drum, bubblegum, chewing gum, kettledrum, kingdom come, on the bum, out of plumb, overcome, sugarplum, zero-sum