Your on the threshold

I was wondering if anybody knew the meaning and origin of the phrase, 'your on the threshold'

OED online says:
/threshold, threshhold/

. noun 1 a strip of wood or stone forming the bottom of a doorway and crossed on entering a house or room. 2 a level or point at which something would start or cease to happen or come into effect.

- ORIGIN Old English, related to THRESH (in the sense 'tread').