Don't lean out too far with 〜と

Grammar Explanation: Natural result with 〜と

Yotsuba and her father are driving to their new home. As they pass a school letting out, Yotsuba waves to a student.

「あんまりのり出(だ)すと危(あぶ)ないぞ」

“It's dangerous to lean out too far.”

Literal: “If you lean out too far, it's dangerous.”

Key Points

1あんまり乗(の)り出(だ)す means “leaning out too far”

あんまり appears in many negative sentences with the meaning “not very”. Here, it modifies 乗(の)り出(だ)す and means “too much”.
乗(の)る (“to get on/ride”) combines with 出(だ)す (“to put out”), giving 乗(の)り出(だ)す the sense of leaning or sticking one’s body out.

2〜と危(あぶ)ない presents danger as the result

と links leaning out too far to danger as a natural consequence.
Yotsuba’s father is warning her, but the grammar is not a request. と cannot express the speaker’s will, so the line presents danger as the result if she leans out.

3ぞ adds force to the warning

ぞ is a sentence-final particle common in casual, masculine speech.
It makes the warning sound blunt and familiar, like “that’s dangerous, you know!”