Verb (5-dan, す, transitive)
1. to set out; to set sail
じゃ、海へ乗り出しますか。Well then, shall we set out to sea?
2. to embark on (a new venture); to set out (to achieve something)
今すぐ調査に乗り出しますよ！I will embark on the investigation right away!
3. to begin to ride
バイクに乗り出したのは高校生の時だ。I started riding motorbikes when I was in high school.
4. to lean forward
そして、彼は乗り出しかけた体を椅子に戻した。Then he sat back in his chair, having started to lean forward.