足がだるいです。

足がだるいです。

My legs feel heavy.

足(あし)がだるいです。

Ashi ga darui desu.

足 (あし)

foot; leg; gait; pace; bottom structural component (i.e. radical) of a kanji; means of transportation; money; coin

が (が)

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

怠い (だるい、たるい)

sluggish; languid; listless; heavy (heart, legs, etc.); dull; bothersome; tiresome

です (です)

be; is

Readings: ソク、あし、た.りる、た.る、た.す

Meanings: leg, foot, be sufficient, counter for pairs of footwear