what does "foe" mean?

[Mancy]

English Language Tests, Intermediate level

ESL/EFL Test #145 "Short Idioms Exam", question 1

After their argument, John didn't know if Rick was a friend or ..........

(a) blood
(b) rival
(c) fiend
(d) foe

English Language Tests, Intermediate level

ESL/EFL Test #145 "Short Idioms Exam", answer 1

After their argument, John didn't know if Rick was a friend or foe.

Correct answer: (d) foe
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what does "foe" mean?

Mancy

[Mister Micawber]

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Do you have a DICTIONARY?
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Native English teacher at Mister Micawber's