godan verb (-mu), transitive verb
put into song; express in verse
Used when turning feelings, stories, or messages into a song or poem. Often implies a creative, expressive act.
彼は自分の思いを歌に歌い込んだ。
He put his feelings into a song.
詩人は自然の美しさを歌い
The poet expressed the beauty of nature in verse.
godan verb (-mu), transitive verb
sing many times; practice a song repeatedly
Focuses on the repetitive action of singing a song, often for practice or to master it.
発表会の前に、その曲を何度も歌い込んだ。
Before the recital, I practiced that song over and over.
彼女は毎日カラオケで同じ歌を歌い込んでいる。
She sings the same song many times at karaoke every day.