1.
If you are flat-footed , the arches of your feet are too low.
He told me I was flat-footed.
ADJ : v-link ADJ , ADJ n , ADJ after v
2.
If you describe a person or action as flat-footed , you think they are clumsy, awkward, or foolish.
...flat-footed writing...
The government could be caught flat-footed.
ADJ : ADJ n , v-link ADJ , ADJ after v [ disapproval ]