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checking, check cracks, map cracks, shelling
1.Shallow cracks at closely spaced but irregular intervals on the surface of mortar or concrete.
2. Small cracks in a film of paint or varnish which do not completely penetrate to the substrate or the previous coat. The cracks are in a pattern roughly similar to a checkerboard.
3. In plastering, in a lime finish coat, fine spider-web cracks or fissures; usually caused by insufficient troweling or undergauging.
4. See check.
5. Very small cracks in a flat glass surface, usually along an edge.