precaution
US /prɪˈkɑː.ʃən/
UK /prɪˈkɑː.ʃən/

1.
a measure taken in advance to prevent something undesirable from happening
:
•
As a precaution, we evacuated the building.
•
Always take necessary precautions when handling chemicals.
a measure taken in advance to prevent something undesirable from happening