There are a number of preposition words that change the meaning of a phrase when used with a particular word. For example, you can use FASLE with different prepositions, and you will get a different meaning every time. You can see the examples below:
1. False
False to (person)
Example: One should not be false to one’s friends.
2. False
False of (thing, heart)
Example: He is not false of heart.