IPA: /ˈhɛlpˌmiːt/
KK: /ˈhɛlpˌmit/
A person who helps another, especially in a supportive or cooperative role, often used in the context of a partner or spouse.
She was his helpmeet, always there to support him in his endeavors.
Helpmeet is formed from "help" (from Old English "helpan", meaning to assist or aid) and "meet" (from Old English "gemetta", meaning a companion or partner). The word "helpmeet" refers to a companion or partner who provides assistance, often used in a context of marriage or partnership.
Think of someone who is a 'companion' ('meet') that 'helps' you — that's why a helpmeet is someone who assists you as a partner.