On the safe side spoken
In most cases, this phrase is used with the infinitive "to be".
To be on the safe side.
If you do something to be "on the safe side", it means you do it to avoid risks or undesirable situations.
The deadline for this assignment is next week, but I will try to finish and submit it tomorrow, just to be on the safe side.
It may not rain, but I still take an umbrella to be on the safe side.
You should go to the hospital, just to be on the safe side.
To act safe; to avoid risks
To long for something/ to do something
I'm itching to go to a tranquil place of quiet beauty.