お下がり

お下がり = hand-me-down (noun)

Examples:

• When I was a child, I wanted new clothes but I always got my sister's hand-me-downs.
• I don't want your old hand-me-downs!
• That ABBA T-shirt is a hand-me-down from my mother.

もったいない

もったいない　＝　wasteful

However, this expression is more natural:

• What a waste!

Examples:

• Sanae dropped a bottle of Dom Perignon Champagne. What a waste!
• That watermelon is rotten; we can't eat it. What a waste!

This expression is to avoid waste (save and re-use):

• Waste not want not.

Example:

• Don't throw away your rice; I will use it for チャーハン tomorrow. Waste not want not.

This expression is to say we don't use an item:

• It is wasted on him

Examples:

• Daisuke bought his grandmother a new Blue Ray DVD recorder but it's wasted on her because she can't understand how to use it.
• Tomoko gave her parents an expensive bottle of wine but it's wasted on them because they don't drink alcohol.
• Those running shoes are wasted on me because I never do any exercise.

Pattern:

• item + be + wasted on + person

面倒臭い

面倒臭い　can be translated according to the situation.

If you are tired or do not want to use your energy you can say:

•  can't be bothered

Miho: "Let's clean up the garden!"

Kou: "I can't be bothered; I wanna watch TV."

If something is complex and requires a lot of effort you can say:

• too much hassle

Yuki: "Shall we move to a new apartment?"

Hana: "Oh no! It's too much hassle."

If you check your dictionary, you will see the word troublesome but this is not a natural translation of 面倒臭い。

オフ

I'm off has four meanings:

1. I'm leaving now

Example:

• I'm off; see you! = I'm leaving this place now.

2. I'm going now

Example:

• I'm off to the pub. = I'm going to the pub now.

3. Absent from work

Example:

• I'm off tomorrow. = I will be absent from work tomorrow.

4. I'm abstaining

• I'm off chocolate. = I don't eat chocolate these days.

Pattern:

Subject + be + off (+ extra information)