Verb (1-dan, intransitive)
1. to climb over; to get over; to cross (a mountain)
乗り越えるにはあそこの塀は高すぎるからな。That wall over there is too high to climb over.
2. to overcome (a difficulty, obstacle, etc.); to surmount; to get through (an illness, crisis, etc.); to get over (e.g. one's pain)
それを乗り越えたんだと思う。I think I overcame it.
3. to surpass (a predecessor); to overtake