underside (noun)

1. The architect designed the staircase with a glass railing so that the beautiful underside of the steps could be seen from below.

2. The artist painted a masterpiece with intricate details, including the portrayal of a dragon on the underside of a leaf.

3. As the protagonist crawled under the bed, she saw a terrifying creature lurking in the dark, its red eyes gleaming from the underside.

4. In the cartoon, the mischievous cat always found a clever way to attach himself to the underside of a flying saucer, causing chaos wherever it went.