1) dry powder from soil, waste etc on the surface of objects, blown about by the wind etc (dust)

2) to make (a pattern, writing etc) that stands out on the surface of (something) (emboss)

3) (a coating of) dirt on the surface of something or on the body (grime)

4) (a sound of) a small movement on the surface of water, crops etc, e.g. made by a gentle wind; a sound of quiet laughter or gossip in a crowd (ripple)

5) to move (something) backwards and forwards on the surface of another (rub)

6) a brown mark on the surface of something (especially cloth), made by dry heat; to burn or discolour the surface of (something) with dry heat (scorch)

7) a grey layer of dirty substances that forms on the surface of water, e.g. in a bath, a pond etc; the worst kind of people (scum)

8) of or on the surface only; not thorough or deep (superficial)

9) a small fold or line in the skin (especially of the kind produced by age) or on the surface of something (wrinkle)