Uncurl (verb)

To straighten out something that is curled.

Origin:

From un- + curl.

Examples:

1. She uncurled her hair with a flat iron.
2. He uncurled the paper to read the article.
3. The cat uncurled its tail before running away.
4. The fern uncurled its fronds after being watered.
5. He uncurled his fists to shake hands.