This is the 5376th most frequent Chinese word.
以防
"To prevent" or "in case of."
Here, '以防' is used as a conjunction meaning 'in case' to express a preventative measure against a possible event.
带伞吧，以防下雨。
Take an umbrella in case it rains.
In this example, '以防' is employed to convey taking precautionary actions to guard against an undesired occurrence.
锁好门窗，以防盗窃。
Lock the doors and windows to prevent theft.
This sentence illustrates '以防' as a foresight measure indicating readiness for any sudden or unforeseen situation.