an action that is done to prevent something unpleasant or dangerous happening
Many people have been stockpiling food as a precaution against shortages.
They failed to take the necessary precautions to avoid infection.
Wearing a helmet is a necessary precaution for safety while biking.
The pilot took every precaution before the flight to ensure a smooth journey.
The warning signs were a precaution against potential hazards in the area.
As a precaution, the company implemented cybersecurity measures to protect sensitive data.