IPA: /hɪəˈwɪð/
KK: /hɪrˈwɪð/
This word is used to refer to something that is included or attached to a document or communication.
Please find the report herewith attached for your review.
Herewith is formed from "here" (from Old English "hēr", meaning in this place) and "with" (from Old English "wið", meaning against or in the company of). The word "herewith" means with this or in this place, often used to refer to accompanying documents or items.
Think of 'here' meaning in this place and 'with' meaning in the company of — so 'herewith' means in this place with something.