noun[mass noun] British
Broken blue stone used for road-making.
- With nature neatly surveyed, fenced and buried under bricks and blue metal, the need to assert their ascendancy over the natural world was reduced.
- When we played kick-to-kick at school we did it on the gravel, when we played vigorous games at home we did it in a gravel backyard strewn with blue metal to keep the weeds at bay.
- Instead of using lucerne hay, compost or cane tops to cover the beds, mulch should consist of hard materials such as gravel, pebbles or blue metal.
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