Arm

Two words written arm form one of the sets of homophones listed by the then Poet Laureate Robert Bridges.
(For more, see Bridges homophones). AWE has a category listing our articles on each of these. They are pronounced IPA: /ɑːm/ in RP.

• The verb 'to arm' means
  • transitively 'to supply with weapons, or armaments', as in 'The USA armed its alliews with copious supplies of ammunition'.
  • Intransitively,

• The noun 'an arm' means 'the human fore- (or upper) limb', of which the usual number is two.

For a similar confusion of homophones, see Alms - arms.