Therewith

Etymology
þær: wiþ:, þærwiþ:. Compare Swedish därmed, Danish derved, German damit.

Adverb

 * 1) With this, that or those.
 * ca. 1370: He ȝaue ȝow fyue wittes//For to wershepen hym ther-with - Piers Plowman, ii-16
 * I have learned, in whatever state I am, therewith to be content. - Philippians, 4:11
 * 1) In addition to that; besides, moreover.
 * To speak of strength and therewith hardiness. - Geoffrey Chaucer
 * 1) Thereupon, forthwith; with that being said or done.
 * 1869: 'I take the privilege, Mistress Ruth, of saluting you.' ...And therewith I bussed her well. - Richard Blackmore, Lorna Doone, 1.