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).
It had large extended arches front and rear made of exotic materials like carbon and kevlar to keep the weight down, lightweight doors, bonnet, spoilers and windows.