(~s, ~ing, ~ed)
1.
Chalk is a type of soft white rock. You can use small pieces of it for writing or drawing with.
...the highest ~ cliffs in Britain...
Her skin was ~ white and dry-looking.
N-UNCOUNT: oft N n
2.
Chalk is small sticks of ~, or a substance similar to ~, used for writing or drawing with.
...somebody writing with a piece of ~.
...drawing a small picture with coloured ~s.
N-UNCOUNT: also N in pl
3.
If you ~ something, you draw or write it using a piece of ~.
He ~ed the message on the blackboard...
There was a blackboard with seven names ~ed on it.
VERB: V n, V-ed
4.
If you say that two people or things are like ~ and cheese, you are emphasizing that they are completely different from each other. (BRIT)
The two places, he insists, are as different as ~ and cheese...
We are very aware of our differences, we accept that we are ~ and cheese.
PHRASE emphasis