noun, plural lean-tos.
a shack or shed supported at one side by trees or posts and having an inclined roof.
a roof of a single pitch with the higher end abutting a wall or larger building. See illus. under roof.
a structure with such a roof.

1425–75; late Middle English; noun use of verb phrase lean to

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
n , pl -tos
1.  a roof that has a single slope with its upper edge adjoining a wall or building
2.  a shed or outbuilding with such a roof

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"building whose rafters pitch against another building or wall," mid-15c., from lean (v.) + to.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
There is no existing barn, and their plans are to construct a lean-to shelter.
Her home now is a precarious lean-to made from a couple of stained, fraying
  sheets tied to some sticks.
Two tiny bedrooms, a lean-to kitchen, half a mile from the village.
Their kitchen and dining room is a lean-to with endless views across the valley.
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