underside

At 1-0 he clattered an effort against the underside of the crossbar, and at 1-1 had a thumping header hit the post.

There was also the matter of the sculpture’s title, “Dark,” which referred to the artist’s claim that the word had been scrawled on the underside of the brute slab.

Make sure the underside is done before turning.

The Independent's three-star review says the show "sticks to the original movie like chewing gum to the underside of a school desk" at first, but changes tack by the second half.

Some of the best examples of mammatus can be seen when the sun is low in the sky, casting light on the underside of the cloud and showing up the 'udders'.