flat foot

noun

(always so in sense 3)
ˈflat-ˌfu̇t How to pronounce flat foot (audio)
ˌflat-ˈfu̇t
variants also flatfoot
plural flat feet ˈflat-ˌfēt How to pronounce flat foot (audio)
ˌflat-ˈfēt
also flatfeet
1
: a condition in which the arch of the instep is flattened so that the entire sole rests upon the ground
2
: a foot affected with flat foot
3
usually flatfoot
a
or plural flatfoots, slang, old-fashioned : police officer
especially : a patrolman walking a regular beat
b
slang, old-fashioned : sailor

Did you know?

In 1899 the police officers of Akron, Ohio, climbed aboard the first police car (a patrol wagon powered by an electric motor). In that same year the noun flatty was first used in print with the meaning "police officer." Mere coincidence? Maybe, but consider that quite a few similar words have been used over the years to distinguish pedestrian officers from mobile ones, including flat, flat arch, flathead, flatter, and flatfoot. Other notable (and more comic) descriptors are pavement pounder and sidewalk snail. Flatfoot dates its "police officer" sense from 1913. It is especially used of those footing it to keep our cities safe, but it can also refer to police in general.

Examples of flat foot in a Sentence

a comic strip about a square-jawed, trench-coated flatfoot who always caught the crooks in suitably dramatic fashion

Word History

First Known Use

1860, in the meaning defined at sense 1

Time Traveler
The first known use of flat foot was in 1860

Browse Nearby Words

Cite this Entry

“Flat foot.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flat%20foot. Accessed 5 Nov. 2025.

Kids Definition

flatfoot

noun
flat·​foot -ˌfu̇t How to pronounce flatfoot (audio)
-ˈfu̇t
plural flatfeet -ˌfēt How to pronounce flatfoot (audio)
-ˈfēt
1
: a condition in which the main arch of the foot is so flattened that the entire sole rests upon the ground
2
: a foot affected with flatfoot
flat-footed
-ˌfu̇t-əd
-ˈfu̇t-əd
adjective

Medical Definition

flatfoot

noun
flat·​foot -ˈfu̇t, -ˌfu̇t How to pronounce flatfoot (audio)
plural flatfeet -ˈfēt, -ˌfēt How to pronounce flatfoot (audio)
1
: a condition in which the arch of the instep is flattened so that the entire sole rests upon the ground
2
: a foot affected with flatfoot
Last Updated: - Definition revised
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