Definition of garden pebble in English:

garden pebble

noun

  • (More fully "garden pebble moth") a Eurasian pyralid moth with brown- and grey-streaked whitish wings, Evergestis forficalis, whose caterpillars feed on cabbages and other brassicas.

Origin

Early 19th century; earliest use found in George Samouelle (d. 1846).