wall box

American  

noun

Building Trades.

1. an enclosed iron or steel socket built into a masonry wall to support the end of a wooden beam.

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Etymology

Origin of wall box

First recorded in 1870–75

Example Sentences

After assigning the Module to control the Hue bulb in my laundry room, all that was left was to tuck the Hue Switch Module into the wall box and remount the switch.

From The Verge

“Pressure/wall/box” has a place in University of North Carolina lexicon.

From New York Times

Unusual examples of the post box range from a Victorian wall box built into an edifice resembling a wayside shrine, to a 1930s "K4 Vermillion Giant" which combines a telephone kiosk, stamp vending machine and post box.

From BBC

The change made the dimmers cooler and small enough to fit in a home wall box.

From New York Times

When a pillow block requires to be enveloped by a wall it is provided with a wall box as shown in Fig.

From Project Gutenberg