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危ないよ

it's dangerous

→ 危ない
phrase Uncommon #18,545
it's dangerous 危ない means “dangerous” or “watch out,” while よ emphasizes that the speaker is informing or warning the listener. Depending on context, it can be translated as “watch out.”
JA: その階段、暗くて危ないよ。
EN: Those stairs are dark and dangerous.

ここら辺を夜歩くのは危ないよ。

It's dangerous to walk around here at night.

このビーチは、夜は危ないよ。

This beach is dangerous at night.

ちょっと、ちょっと危ないよ。

Hey, careful! That's dangerous.

水道水は危ないよ。

Tap water is dangerous.

火遊びは危ないよ。

Playing with fire is dangerous.

ここは危ないよ。

It's dangerous here.

危ないよ～！

That’s dangerous!

— 崖の上のポニョ (2008)

危ない・・危ないよ

Watch out... watch out!

— ロード・オブ・ザ・リング／王の帰還 (2003)

屋上は危ないよ

The rooftop is dangerous.

— ダイ・ハード (1988)

危ないよ。

That's dangerous.

— ソング・オブ・ザ・シー 海のうた (2014)

道路で遊ぶと危ないよ。

It's dangerous to play in the street.

ちょっと、危ないよ。

Hey, watch out. You're going to hurt yourself.