To keep a lid on it 不要声张，保守秘密
The script of this programme 本节目台词
(sound of coffee cup being put on a table)
Li: Thanks for the coffee, Neil. What a good idea to present Authentic Real English from a coffee shop!
Neil: Yes, Li, it's good to get out of the studio - and anyway, I get the coffee for free here.
Li: You don't pay for it?! 你在这家咖啡厅能喝免费咖啡？为什么你的咖啡不要钱？
Neil: (Sounding slightly vague) Contacts.
Li: … contacts?
Neil: Yes, people I know. Don't tell anyone but my friend works here and… well… when the boss isn't around, he gives me the coffee for free.
Li: (loudly and surprised) He gives it to for free?
Neil: Ssshhh! Keep your voice down. If he gets found it he'll get the sack, you know lose his job. We need to keep a lid on it.
Li: 把盖子盖上？！Why do we need to keep a lid on the coffee? Are we trying to hide it?
Neil: No Li. When you say keep a lid on something, it means keep it a secret – or keep it quiet about it…
Li: Oh I see. 当你说把盖子盖上的时候，意思是别吱声，保密。
Neil: The phrase can also mean keep something strongly under control. Like your loud voice – control it and don't tell everyone! Keep a lid on it.
Li: 这个表达还有一个意思是控制住局面。We had better hear some examples while I drink my coffee... quietly!
- We need to keep a lid on the company merger – if the newspapers get to hear about this, our share price will drop.
- Our baby is due in November but keep a lid on the news – we haven't told our parents yet.
- Please – keep a lid on your emotions – otherwise the waiter is going to ask us to leave!
Li: 现在我完全明白了。To keep a lid on something 意思就是别声张，保守秘密还有克制情绪或局面的意思. (sips coffee) Mmm, this coffee does taste good but I don't like the idea that you got it for free – it's dishonest… 我得举报你这种不诚实的行为。不付钱白喝，这多不好呀。
Neil: What's that Li?
Li: Oh nothing – I was just saying I might have to tell someone about your dishonest behaviour.
Neil: Ah! You mean you're going 'to lift the lid' on what I'm doing – that means to tell someone about something bad – well, you can but you know what that will mean?
Li: What's that?
Neil: You'll be buying the coffee next time – and it's not cheap!
Li: Oh right – let's just keep it our little secret for now shall we?
Neil: OK Li!