flint
nounUK /flɪnt/
US /flɪnt/
Flint is a very hard gray rock that makes sparks when you hit it.
Long ago, people used flint to start fires.
OTHER MEANINGS
2. A small piece of metal used to make a spark in a lighter.
He replaced the flint in his lighter so it would work again.
3. A dark gray color.
The sky turned a deep flint gray before the storm.
4. Something very hard and unyielding.
Her flint heart would not soften, no matter how he pleaded.