I have been recently reading Romeo and Juliet, and towards the beginning of the balcony scene, Juliet says
What does this phrase mean and when was it first created/used?
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At the time of writing, English was heavily influenced by French. It may therefore be best to look to France for an explanation:
Glossaire de la Langue Romaine
has: Ainmi, aimi, aimini, aymi, emi, heimi, hemi; Exclamation. Le pronom mi, moi, réuni à l'optatif du verbe aier, aider, a produit ces exclamations composées.
Loosely translated, this says:
Ainmi, aimi, aimini, aymi, emi, heimi, hemi; Exclamation.
The pronoun mi or moi, joined to the optative form of the verb aier, or aider, (to help) has produced these joined exclamations.
The optative form is a grammatical mood that indicates a wish or hope regarding a given action. Hence we may understand Juliet to be saying "I hope I may be helped", which fits the context of her difficult amorous predicament. .