I.down1[美 daʊn, 英 daʊn]副down often appears as the second element of certain verb structures in English (back down, clamp down, tone down, etc). For translations, see the relevant verb entry (back, clamp, tone, etc).
A sliding pit configuration, with dirt cut-outs only around the bases, was installed in 1971, primarily to keep the dust down in the breezy conditions.