rule of thumb
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
1692
First Known Use of rule of thumb
1692
Seen and Heard
What made you want to look up rule of thumb? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!