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Feet are 足, and legs are also 足.

Is there a word or method with which I can easily talk about one and not the
other? And if not, why is there no word for feet in the Japanese language?

Caveat: I know that one can just use フィート but that feels so very not
Japanese...
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nuances words
How can I differentiate between feet and legs?
I think the problem here is that languages in general don't always equate 1:1
with other languages. For instance there is also no difference in Japanese
between pigeons and doves or squirrels and chipmunks. The problem is that we
know English in which there are two distinct words to tell the difference, so
that's how we percieve the situation. Japanese on the other hand have always
had just one word, so don't even think of the need to differentiate between
the two.

To answer you question though, I don't think there is a way to differentiate.
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> Is there a word or method with which I can easily talk about one and not the
> other?

A short answer is that there is no simple way. If you have to talk
specifically about foot but not leg, you have to explain it such as
足{あし}の足首{あしくび}から先{さき}の部分{ぶぶん} (the part of leg which is below ankle).
Similarly, you have to exclude foot, you have to explain it such as
足{あし}の足首{あしくび}より上{うえ}の部分{ぶぶん} (the part of leg which is above ankle).

There are two kanji for あし: 足 and 脚. Sometimes they mean different parts of
human body, in which case 足 means foot and 脚 means leg (including thigh but
usually not including hip). But this is not always the case, and in particular
足 can also mean the same part as 脚. My personal impression is that using 脚 for
foot is rare.

As technical terms in medicine,
[足](http://www5.atpages.jp/motoneuron/?%E8%B6%B3) always means foot, and
[下肢{かし}](http://www5.atpages.jp/motoneuron/?%E4%B8%8B%E8%82%A2) means [lower
limb](http://en.wikipedia.org/wiki/Lower_limb) (which is a little broader than
“leg”). The precise meaning of “leg,” which is the free part of lower limb
(the part of lower limb that we can move by will), is called
[自由下肢{じゆうかし}](http://www5.atpages.jp/motoneuron/?%E8%87%AA%E7%94%B1%E4%B8%8B%E8%82%A2).
But 下肢 is a formal word and not usually used in a daily conversation, and 自由下肢
is completely a technical term and at least I did not know the term 自由下肢 at
all until I looked it up just now.
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2011-06-04T04:37:25.867
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At first glance we might think Japanese inaccurate because we can't indicate
leg as different from foot. In practice i find Japanese native speakers go one
level of detail deeper and refer more specifically to ankle 足首, thigh 腿, toe
tips 爪先, knees 膝, heel かかと and calf 脹脛.

As a martial arts instructor I have to talk about legs, feet and ankles a lot,
often in Japanese. I've also heard endless hours of my Japanese teachers
talking about them. Not being able to say leg, needless to say, has never come
up _grin_

Did you have a specific usage in mind (eg. hey nice feet!)
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2011-06-04T05:53:20.783
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Appreciate this question is very old, but the thought occurred to me and this
thread was a top search result. I wasn't sold on any of the answers so I asked
my wife (who is a native Japanese speaker). When I asked "how do I say my feet
are cold?", she replied 足が冷たい, so I followed up "but how do I distinguish
between my legs and feet?". The answer was very simple: 足先 (あしさき).

For those unsure, this is something like "the end section of the leg" and you
might be conceptually familiar with it if you've ever ordered 手羽先 which is the
second segment (with two boxes, less meat and more yum) in chicken wings. Hope
this can be of help to any future googlers.
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