'Leaner' definitions:

Definition of 'leaner'

noun

(horseshoes) the throw of a horseshoe so as to lean against (but not encircle) the stake

From: GCIDE

Lean \Lean\ (l[=e]n), a. [Compar. Leaner (l[=e]n"[~e]r); superl. Leanest.] [OE. lene, AS. hl[=ae]ne; prob. akin to E. lean to incline. See Lean, v. i. ]
1. Wanting flesh; destitute of or deficient in fat; slim; not plump; slender; meager; thin; lank; as, a lean body; a lean cattle. [1913 Webster]
2. Wanting fullness, richness, sufficiency, or productiveness; deficient in quality or contents; slender; scant; barren; bare; mean; -- used literally and figuratively; as, the lean harvest; a lean purse; a lean discourse; lean wages. "No lean wardrobe." --Shak. [1913 Webster]
Their lean and flashy songs. --Milton. [1913 Webster]
What the land is, whether it be fat or lean. --Num. xiii. 20. [1913 Webster]
Out of my lean and low ability I'll lend you something. --Shak. [1913 Webster]
3. (Typog.) Of a character which prevents the compositor from earning the usual wages; -- opposed to fat; as, lean copy, matter, or type. [1913 Webster]
Syn: slender; spare; thin; meager; lank; skinny; gaunt. [1913 Webster]