turn on

1.打開;發動(水、電視、收音機、燈、煤氣等）

Will you turn onthe radio?

你打開收音機好嗎?

2.(使)興奮；感興趣

Many young people are taking drugs to turnon.

許多年輕人吸毒尋求刺激。

His normally placid dog turned on him and bit him in the leg.
他那條狗平日很溫順，這次突然發作咬了他的腿。