breed¹/brid; briːd/ v bred /brɛd; bred/, bred, breeding 1 [I] if animals breed, they have babies 〔动物〕繁殖，下崽，下蛋: Rats can breed every six weeks. 老鼠能每六星期繁殖一次。 2 [T] to keep animals or plants in order to produce young animals or develop new plants 育种，饲养繁殖; 培植: He breeds cattle. 他饲养牛。 3 [T] to cause a bad feeling or situation, which develops and gets worse 引起; 酿成，招致〔不良之事〕: crowded living conditions that breed violence and crime 招致暴力和犯罪的拥挤的生活条件