be on about

(Brit. informal)talk about tediously and at length

(英，非正式)滔滔不绝地谈

she's always on about doing one's duty.

她总是滔滔不绝地谈尽义务。

be on at someone

(Brit. informal)nag or grumble at someone

(英，非正式)对某人不断唠叨

be on to someone

(informal)be close to discovering the truth about an illegal or undesirable activity that someone is engaging in

(非正式)几乎发现某人的非法行径

be on to something

(informal)have an idea or information that is likely to lead to an important discovery

(非正式)（对重要发现）有头绪

it's not on

(informal)it's impractical or unacceptable

(非正式)这是不实际（或无法接受）的

on it

(Austral. informal)drinking heavily

(澳，非正式)大量喝酒

on side

supporting or part of the same team as aomeome else

支持

on to

moving to a location on (the surface of something)

（移动到）…上

they went up on to the ridge.

他们爬上了屋脊。

moving aboard (a public service vehicle) with the intention of travelling in it

登上（公共交通工具）

we got on to the train.

我们上了火车。

what are you on?

(informal)said to express incredulity at someone's behaviour, with the implication that they must be under the influence of drugs

(非正式)（表示惊奇）你吃错药啦？

you're on

(informal)said by way of accepting a challenge or bet

(非正式)一言为定

be on to&I{【俚语】}

To be aware of or have information about

知道，意识到：意识到…或知道…的情况

You'll never deceive us again; we're on to you.

你再也骗不了我们了；我们已识破了你的诡计

on and off

Intermittently.

间断地，持续地

on and on

Without stopping; continuously.

无间断地；连续不断地