dans la largeur

listen to the pronunciation of dans la largeur
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breadthwise
Across the breadth of an object or place

The tubes should be placed breadthwise inside the box.

directed across the breadth of an object or place

Make a breadthwise cut.

In the direction of the breadth
in the direction of the breadth; "cut the cloth breadthwise
in the direction of the breadth; "cut the cloth breadthwise"