[shim] 
noun, verb, shimmed, shim⋅ming.| 1. | a thin slip or wedge of metal, wood, etc., for driving into crevices, as between machine parts to compensate for wear, or beneath bedplates, large stones, etc., to level them. |
| 2. | to fill out or bring to a level by inserting a shim or shims. |
| shim (shĭm) n. A thin, often tapered piece of material, such as wood, stone, or metal, used to fill gaps, make something level, or adjust something to fit properly. tr.v. shimmed, shim·ming, shims To fill in, level, or adjust by using shims or a shim. [Origin unknown.] |