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feed off

phrasal verb
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feed on/off something
  1. (of an animal动物) to eat something以…为食
    • Butterflies feed on the flowers of garden plants.蝴蝶以园林中草木的花为食。🔊🔊
    • The seals feed mainly on fish and squid.海豹主要以鱼和鱿鱼为食。
  2. (often disapproving) to become stronger because of something else因…而壮大；从…中得到滋养
    • Racism feeds on fear.恐惧心理会助长种族主义。🔊🔊
    • He feeds off the work and reputation of others.他养育了他人的工作和声誉。