keep a lid on
To keep something secret.
It's supposed to be a surprise, so try to keep a lid on it, will you?
lid
UK /lɪd/ US /lɪd/
noun 5verb 1
Definitions
noun
1
The top or cover of a container.
2
A cap or hat.
“Yes, sir, if that was the language of love, I'll eat my hat,” said the blood relation, alluding, I took it, to the beastly straw contraption in which she does her gardening, concerning which I can only say that it is almost as foul as Uncle Tom's Sherlock Holmes deerstalker, which has frightened more crows than any other lid in Worcestershire.
3
One ounce of cannabis.
4
A bodyboard or bodyboarder.
Mal rider, shortboard or lid everyone surfs like a kook sometimes.
the rest of us managed to dodge out of control lid riders
5
An operculum or other lid-like cover.
verb
1
To put a lid on (something).
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