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
_________________________

what does "foe" mean?

Mancy

[Mister Micawber]

.
Do you have a DICTIONARY?
.
_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mister Micawber