How to use
used to emphasize a particular person or thing
One person I find very difficult is Bob.
If there's one thing I can't stand, it's people who bite their nails.
one day/morning/year etc
on a particular day, morning etc in the past
One morning I was sitting at my desk when a policeman knocked at my door.
used to talk about a day, morning etc in the future which is not yet exactly known or decided
We should go out for a drink one evening.
One day she hopes to move to the South Coast.
used to talk about a particular person or thing in comparison with other similar people or things
Why does my card work in
cash machine and not in
It's one thing to ... it's (quite) another to
used to say that the second thing mentioned is very different from the first, and is often much more difficult to do
It's one thing to say we have a goal; it's another to actually act on it.
for one thing
used to introduce a reason for what you have just said
He couldn't bring himself to say what he thought.
For one thing
, she seldom stopped to listen.
, he doubted that he could make himself clear.
be one crazy woman/be one interesting job etc
especially American English
to be a very crazy woman, be a very interesting job etc
You're one lucky guy.
used before the name of someone you do not know or have not heard of before
He was accused of stealing a horse from one Peter Wright.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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