At the table next to Harry and Ron, Dean had paired up with Neville, who immediately embarked on a longwinded explanation of a nightmare involving a pair of giant scissors wearing his grandmother’s best hat; Harry and Ron merely looked at each other glumly.
There are no more uses of "embark" in the book.
Show samples from other sources
she embarked upon a new career
Before you embark on a journey of revenge, dig two graves.