flap-door

Aziza chose a gum-ball machine-the same coin could be inserted to get candy, then retrieved from the flap-door coin return below.

A Thousand Splendid Suns Hosseini, Khaled 2007

But here Mahony gave a loud click of the tongue — in the general howl of execration it passed unheard — and, pushing his way out of the tent, let the flap-door fall to behind him.

Australia Felix 2003

The sound of advancing footsteps stopped at the gate, a small flap-door let in it flew open, and Matilda Bunker's open countenance took a pinkish hue, as a small man in jersey and blue coat, with a hard round hat exceeding high in the crown, stepped inside.

Many Cargoes 1903

She raised a flap-door located at one side of the counter.

The Albert Gate Mystery Being Further Adventures of Reginald Brett, Barrister Detective Louis Tracy 1895

Each of these measures, however, had a hole in the side near the bottom for the corn to run through, and irons to which a little flap-door was once affixed in front of this hole.

Wanderings by southern waters, eastern Aquitaine Edward Harrison Barker 1885

B, a flap-door, four inches wide, which is raised for cleaning out the floor; under this door is a space of one inch, for passing out the urine of the rabbits.

Rural Architecture Being a Complete Description of Farm Houses, Cottages, and Out Buildings Lewis Falley Allen 1845