lean-to

lean-to is an   Adverb

Definition:

[1] Having only one slope or pitch; -- said of a roof. -- n.

[2] A shed or slight building placed against the wall of a larger structure and having a single-pitched roof; -- called also penthouse, and to-fall. The outer circuit was covered as a lean-to, all round this inner apartment. De Foe.

Synonyms: