Definition from Wiktionary, the free dictionary
- Again, a further time, once again.
1913, Joseph C. Lincoln, chapter 4, Mr. Pratt's Patients:
- I told him about everything I could think of; and what I couldn't think of he did. He asked about six questions during my yarn, but every question had a point to it. At the end he bowed and thanked me once more. As a thanker he was main-truck high; I never see anybody so polite.
- Used other than as an idiom: see once, more.