rule of thumb

[kohyoongliat]

What does "a good rule of thumb" mean? I think I've also read 'rule of thumb".

Thanks in adance.

[Noego]

I think it best translates as:

"as a general rule"

For example:

"As a rule of thumb, I always go to bed early when I have to work the next day."

If you have any further questions, feel free to ask