Too long without practice leaves one's edge rusty.

For example where a hole appears in the wing of a car and a pedestrian is cut by the sharp rusty edges of the hole, then danger is caused.

The gloss of promotion came with a rusty edge.

He had to clear his throat before he began, as if the very words themselves, words never before spoken to another soul, had sharp, rusty edges.

'You know nothing of loneliness,' Morgan hissed, his voice suddenly growing a hard, rusty edge.

The last two words had a rusty serrated edge on them, but Will ignored it.

The rain pattered down softly and dripped off the Mini's rusty edges, trickling to join the puddle they were already lying in.

Houlihan's voice contained a bitter, rusty edge that they both felt.

It's only when he gets angry that he comes to life and his voice takes on a shank's edge, dull and rusty.

Even so, when she plays a few bars of "Another Winter," its poignant wail can still send a chill, even with a rusty edge.