adjective
1.
without naturally raised curves (= arches ) under the feet
2.
( especially NAmE ) not prepared for what is going to happen :
They were caught flat-footed by the attack.
adjective
1.
without naturally raised curves (= arches ) under the feet
2.
( especially NAmE ) not prepared for what is going to happen :
They were caught flat-footed by the attack.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005