Definition of "midriff"

I stuck it out for about an hour and then, apprised by a hollow feeling in the midriff that the dinner hour was approaching, laid a course for home.

1960, P[elham] G[renville] Wodehouse, chapter XXI, in Jeeves in the Offing, London: Herbert Jenkins

But by Season 3, she said her patience had fizzled like bad Champagne after Emily grossly mispronounced “bien sûr” (“of course!”), flashed her midriff at the office and mistook George Sand, the French romantic writer, as a man.

2023 January 20, Dan Bilefsky, “American Expatriates in Paris Wish Emily Cooper Would Go Home”, in The New York Times‎