p. pr. & vb. n. of Flat\nn. The process or operation of making flat, as a cylinder of\n glass by opening it out.\nn. A mode of painting,in which the paint, being mixed with\n turpentine, leaves the work without gloss.\nn. A method of preserving gilding unburnished, by touching\n with size.\nn. The process of forming metal into sheets by passing it\n between rolls.