How do your pronounce err as in on the side of

The word "err" in the phrase "on the side of err" is pronounced as "er".

It sounds similar to the word "her" but with a shorter, less drawn-out vowel sound.

Here's a breakdown:

* "er" is the vowel sound, similar to the "e" in "bed"

* The "r" is a soft, almost silent "r" sound, similar to the "r" in "star"

So the pronunciation of "err" in this context would be: "er".