To thrust or shove something into (another thing); to cram or stuff something inside.
袋に本を無理やり突っ込んだ。
I shoved the books into the bag.
コードをコンセントにしっかり突っ込んでください。
Push the cord firmly into the outlet.
箱に服をぎゅうぎゅうに突っ込んでしまった。
I crammed the clothes into the box until it was packed tight.
To plunge or charge into something; to rush or crash into (intransitive).
彼は会議室に勢いよく突っ込んできた。
He stormed into the meeting room.
子どもがボールを追って道に突っ込んだので、急ブレーキを踏んだ。
A child ran into the street chasing a ball, so I slammed on the brakes.
車がガードレールに突っ込んで止まった。
The car crashed into the guardrail and stopped.
To delve into a matter; to go deeply into a topic or get to the heart of something.
その調査では原因を突っ込んで調べる必要がある。
The investigation needs to probe into the cause.
会議で数字の根拠についてもっと突っ込んだ質問が出た。
At the meeting, there were more probing questions about the basis of the figures.
彼女は表面的な説明に満足せず、問題の本質に突っ込んだ。
She wasn't satisfied with superficial explanations and went into the essence of the problem.
To press or grill someone about something; to point out inconsistencies or question sharply.
記者が政治家の発言に突っ込んだ質問をした。
A reporter fired a pointed question at the politician's remark.
面接官に経歴の不自然さを突っ込まれて、うまく答えられなかった。
The interviewer pressed me about inconsistencies in my resume and I couldn't answer well.
同僚から仕事の進め方を突っ込まれて、説明に時間がかかった。
A colleague grilled me about my way of working, and it took time to explain.
To get involved in someone else's affairs; to meddle or poke one's nose into something.
彼はいつも他人の問題に首を突っ込む癖がある。
He always has a habit of sticking his nose into other people's problems.
余計なことに突っ込まないで、まず自分の仕事を片付けなさい。
Don't meddle in unnecessary matters; first finish your own work.
隣人の喧嘩に突っ込むのは危険だ。
It's dangerous to get involved in neighbors' fights.
To retort or make a quick quip in response; to deliver a comedic or sharp comeback (colloquial).
漫才でボケに対して兄がすぐに突っ込んだ。
In the manzai act, the older brother immediately delivered the tsukkomi to the boke.
その冗談に、友達が鋭く突っ込んだ。
A friend sharply retorted to that joke.
会話の流れで彼女が軽く突っ込んできて、場が和んだ。
She made a light quip in the flow of conversation, and it eased the mood.