How to use
not before noun
used to say that someone continues to do something or something continues to happen, without stopping
We decided to play on even though it was snowing.
on and on
talked for a very long time
about his job all evening.
if you move, walk etc on, you move forward or further towards something
If you walk on a little, you can see the coast.
We drove on towards Manchester.
later than or after a particular time
Now, forty years on, this is one of the most successful theatres in the country.
From that moment on I never believed a word she said.
if you have something on, you are wearing it
was a pair of tattered shorts.
. It's freezing outside.
used to say that something is attached to something else, especially when it is in the correct position
Is the cover on properly?
Remember to put the lid back on.
used to say that something is written somewhere
He was wearing a badge with his name on.
in or into a bus, train etc
The train stopped and two people got on.
if a machine, light etc is on, it is operating
Who left all the lights on?
The TV's on, but nobody seems to be watching it.
He sat down at the desk and switched on the computer.
if a radio or television programme etc is on, it is being broadcast
What time is 'Star Trek' on?
if an event is on, it has been arranged and is happening or will happen
The transport union has confirmed that the strike is definitely on.
I'd avoid the city centre - there's some kind of procession on.
Is the party still on tonight or have they cancelled it?
performing or speaking in public
You're on in two minutes.
if you are on at a particular time, you are doing your job at that time
I'm not on again until 2 o'clock tomorrow.
have something on
if you have something on, there is something that you must do
I haven't got anything on tomorrow, so I could see you then.
We've got a lot on at the moment.
on and off
off and on
for short periods but not regularly over a long period of time
He's been smoking for 10 years now, on and off.
be/go/keep on at somebody
to keep complaining to someone or asking someone to do something, especially when this annoys them
I've been on at him to fix that cupboard for weeks now.
I wish you wouldn't go on at me the whole time!
be/go/keep on about something
to keep talking about something, in a way that is boring or annoying
He's always going on about money.
I don't know what you're on about!
be not on
if something is not on, it is not acceptable or reasonable
I'm sorry, what you're suggesting is just not on!
be on for something
to be ready or willing to do something that someone has suggested
Right, how many of you are on for a drink after work?
used tell someone that you accept a
or an invitation to compete against them
'I bet you £20 he won't turn up.' 'You're on!'
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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