The crossword solution for the term 'AND POLISH' is 'SPIT'. This is an acronym for 'Simultaneous Polishing of Instrument Tips', which is a technique used in the field of optics. It involves the simultaneous polishing of multiple optical surfaces, such as lenses and mirrors, to create a smooth, uniform finish. This technique is often used to improve the performance of optical instruments, such as telescopes and microscopes.