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).
Fierce competition from savvy low-cost rivals, a growing number of them selling online, is beginning to re-shape shopping habits and drag down conventional operators.