godan verb (-su), intransitive verb
start walking; begin to walk
Literal physical action of beginning to walk.
彼は何も言わずに歩き出した。
He started walking without saying anything.
赤ちゃんが一人で歩き出すのを見た。
I saw the baby start walking on their own.
godan verb (-su), intransitive verb
begin (something new); embark on
Metaphorical use: starting a new phase, project, or way of life. Often used with abstract nouns like 人生, 道, 旅.
彼は新しい人生を歩き出す決心をした。
He decided to embark on a new life.
私たちは一緒に未来へ歩き出そう。
Let's walk into the future together.