equip
Pronunciation: /ɪˈkwɪp/
verb ( equips, equipping, equipped)

Origin:
early 16th century: from French équiper, probably from Old Norse skipa 'to man (a ship)', from skip 'ship'

Spelling rule
If a verb ends with a single vowel plus a consonant, and the stress is at the end of the word (as in refer), double the last letter when adding -ing or -ed: