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go to town ( on something) = 熱心にやる　成功する

oxford の定義　→　to do something with a lot of energy, enthusiasm, etc., especially by spending a lot of money

She really went to town on the decorations for the party. (Merriam-Webster OnLine)

snap at = to speak using short, angry sentences or phrases

They argued and snapped at each other all the time. (Merriam-Webster OnLine)

snap 意味ありすぎだし・・・。

make no bones about = （言いにくいことを）単刀直入に話す　～をためらわない　～を隠し立てしない

Merriam-Webster OnLineの定義 = to be very sure and definite about (something)

He made no bones about his plans to cut expenses. (Merriam-Webster OnLine)

Tom made no bones about wanting to be promoted. (answers. com)

by the skin of one's teeth = only by a small difference in time, space, or amount : just barely

He escaped by the skin of his teeth. [=he just barely escaped]

She only passed the test by the skin of her teeth. [=she almost did not pass the test]

(すべてMerriam-Webster OnLine)

pass with flying colors = 立派に合格する　成し遂げる　

oxfordの定義→　with flying colors = very well ; with a very high mark

She passed the exam with flying colors. (oxford)
They came through the ordeal with flying colors. (Merriam-Webster OnLine)

get by in = ～の言語でうまくやる

I can just about get by in German. (= I can speak basic German). (oxford)

in が付くと「～の言語でなんとかやる」という意味あいになる。言語のことを言う以外には onやwith も使われる。ex) How does she get by on such a small salary? (oxford)

touch up = 手を入れて仕上げる　改良する

oxfordの定義 = improve something by changing or adding to it slightly

She was busy touching up her make-up in the mirror. (oxford)

come in for = （非難など）を受け入れる

oxfordの定義 = receive something unpleasant

The government's policies are coming in for increasing criticism. (Merriam-Webster OnLine)

come into = 相続する
Merriam-Webster OnLineの定義 = to get (something) as a possession

He came into a fortune when he inherited his father's estate. (Merriam-Webster OnLine)

もちろんフツーに「enter」の意味や「be involved in 」の意味もある。
「be involved in 」の例文
Deciding who to hire should be a business decision. You shouldn't allow personal feelings to come into it. [=you shouldn't allow personal feelings to affect your decision]　(Merriam-Webster OnLine)

hold out = 希望を抱かせる

Merriam-Webster OnLineの定義 = to say that there is a good reason to have (something, such as hope)

Doctors hold out little hope of her recovering. (oxford)

hold out は他にも状況によってとってもたくさんの意味を持つPV。ありすぎなので省略。ヽ(`Д´)ノ

take back = （言葉）を取り消す

Ok, I take it all back! (oxford)
My mom is not fat! Take it back! (Merriam-Webster OnLine)

他にも「return」や「accept again」の意味もある。

また、This meal takes me back to our vacation in Mexico. (Merriam-Webster OnLine)といったら、This meal makes me remember our vacation in Mexico. の意味。

top off A with B = A を B で終える　閉める

Merriam-Webster OnLineの定義 = to end (something) usually in an exciting or impressive way

・We topped off dinner with dessert and coffee.
・The band topped off the show with an extended version of their classic hit.
・The victory tops off the coach's extremely successful career.
(すべてMerriam-Webster OnLine)

back down = 引き下がる　撤回する　逃げる

Merriam-Webster OnLineの定義 = to stop arguing or fighting for something

Don't back down just because he threatened you. (oxford)

The government backed down from its position. (Merriam-Webster OnLine)

at length = 　詳細に

He quoted at length from the report.
He told me at length about his new job. (共にoxford)

atとlengthの間にconsiderable/great/someなどが入ることがある。否定文ではNo one was questioned at any length about it. (Merriam-Webster OnLine)など。

文学作品などでfinally、at last、in the endの意味になる。

fall in with = agree to　一致する　同意する　人と偶然出会う　友達になる

She fell in with my idea at once. (oxford)

set A against B = AとBを対立させる

She accused her husband of setting the children against her. (oxford)

play on = つけ込む　（人）の感情を刺激する　take advantage of

Advertisements often play on people's fears. (oxford)

The company plays on the concerns of parents in order to sell their products. (Merriam-Webster OnLine)

mark up = 価格を引き上げる　increase the price of something

Share prices were marked up as soon as trading started. (oxford)
a product marked up by 10 percent (Merriam-Webster OnLine)

marked-up price で「引き上げ価格」。

to make marks and write comments in or on (something) の意味もあり。
（例）mark up a manuscript

look in on = make a short visit　人をちょっと訪ねる

Why don't you look in on me next time you're in town. (oxford)

hand it to = ～を正当に評価する

Merriam-Webster OnLineの定義 → to give credit to (someone) for doing something

You've got to hand it to her - she's a great cook. (oxford)

I've got to hand it to you. You did a great job planning the party. (Merriam-Webster OnLine)