[an imperative verbal noun, which may be rendered On!] a word of incitement. (S, K.) One also says to a man, and to a horse, يَا وَيْهَاهْ [Ho! On!]. (A'Obeyd in TA in article ايه.) See أَيَّهَ.
2.
وَيْهَكَ: see أَيْهَكَ in article ايه. I have not found this anywhere but in that article in the K, and doubt its correctness.