The act of driving or pounding something in (e.g., driving stakes or nails into something).
工事のために杭の打ち込みを始めた。
They began driving the piles for the construction.
釘の打ち込みが不十分で、戸がゆがんでいる。
The nails weren't driven in properly, so the door is warped.
Falling deeply in love with someone (colloquial usage).
彼は彼女にすっかり打ち込み、仕事どころではなくなった。
He fell completely for her and couldn't focus on work.
若いころは一度打ち込みすると周りが見えなくなることがある。
When young, once you fall hard for someone you can sometimes lose sight of everything else.
Putting one's heart and effort into something; being devoted or absorbed in work or practice.
彼女の仕事への打ち込みは職場で高く評価されている。
Her dedication to her work is highly valued at the office.
上達の秘訣は練習への打ち込みにある。
The secret to improvement lies in how devotedly you practice.
彼の練習への打ち込みは周囲の励みになった。
His commitment to practice encouraged those around him.
In computing and music production, 'uchikomi' refers to data/input recorded via step entry or computer-generated tracks (e.g., programmed drums).
この曲はドラムを打ち込みで作ってから、生演奏を加えた。
This song's drums were programmed first, then live performances were added.
打ち込みだけで作った曲は機械的に聞こえることがあるが、使い方次第で表現の幅が広がる。
Songs made entirely with programmed parts can sound mechanical, but used well they expand expressive possibilities.