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[on one's mind]  {adv. phr.}

В чьих-либо мыслях.

I'm glad you want to talk about this. It's been on my mind for weeks.

What's on your mind?

Ср.: [IN MIND].

[on one's own]  {adj. phr.}

Без посторонней помощи.

It is a happy day when you're allowed to drive a car on your own.

Being on your own may be a frightening experience.

Ср.: [GO IT] (2).

[on one's toes]  {adj. phr.},  {informal}

Бдительный (нареч. начеку, настороже, наготове); готовый к действию.

The successful ball player is always on his toes.

Ср.: [HEADS-UP], [ON THE BALL].

[on one's uppers]  {adj. phr.},  {informal}

Очень бедный.

Mr. White had been out of work for several months and was on his uppers.

Ср.: [DOWN ON ONE'S LUCK].

[on the ball]  {adj. phr.},  {informal}

1. Внимательный и старательный. — Исп. после "is" или "get".

Ben is really on the ball in school.

* /The coach told Jim he must get on the ball or he cannot stay on the  […]

[on the button]  {adv., adj.},  {slang}

В нужном месте; по существу дела.

John's remark was right on the button.

Ср.: [ON THE DOT].

[on the fly] (1)  {adv. phr.}

1. Налету; в полете.

The bird caught a bug on the fly.

Joe was called out because the catcher caught the ball on the fly.

2.  {informal} Между делом; помимо этого выполняя  […]

[on the go]  {adj. phr.},  {informal}

Активный и занятой.

Successful businessmen are on the go most of the time.

Healthy, happy people are usually on the go.

Ср.: [ON THE MOVE].

[on the point of]  {prep.}

в готовности начать; очень близко к тому, чтобы (что-либо сделать), на грани. — Обычно используется с отглагольном  […]

[on the Q.T.]  {adv. phr.},  {informal}

Тайно; никому не сообщив.

George and Paul formed a club on the Q.T.

The teachers got the principal a present strictly on the Q.T.

(от прил. "quiet" — секретный,  […]