noun
foot
A1
Fuß means 'foot' (body part or unit). Masculine noun: der Fuß, plural Füße (umlaut + irregular plural). Genitive singular des Fußes; dative den Füßen. Note the vowel change (u → ü) in plural. No special prepositions; appears in many idioms and measurement contexts (e.g., Fuß as unit).
Examples
Sie hat sich den Fuß verletzt.
She injured her foot.
Der Arzt untersuchte den Fuß des Patienten, weil der Patient über starke Schmerzen geklagt hatte.
The doctor examined the patient's foot because the patient had complained about strong pain.
Ich gehe zu Fuß.
I'm walking.
Details
Mnemonics
Picture a foot with the label 'Fuß' stamped on the sole.
Sounds like English 'foos' — think of the bottom of your leg.
der Fuß — imagine a man (der) stomping with his foot.
Notes
Plural is Füße (note the umlaut and '-e' ending).