flat-footed

adjective

🔊/ˌflæt ˈfʊtɪd/

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without naturally raised curves (= arches) under the feet 平足的；扁平足的
(especially North American English) not prepared for what is going to happen无准备的
- They were caught flat-footed by the attack.他们冷不防遭到了攻击。🔊🔊