Definitions

1. verb

to desert or renounce one’s faith or cause, especially after previously embracing it.

“The politician was accused of apostatising his former party’s values.”

2. verb (transitive)

to cause (someone) to desert or renounce their faith or cause.

“The propaganda campaign was accused of apostatising many young minds.”

3. noun

the act of deserting or renouncing one’s faith or cause.

“The apostatisation of the former soldier was a shock to his comrades.”