1. To arch over.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• iverarch,
• kverarch,
• lverarch,
• pverarch,
• 0verarch,
• 9verarch,
• ocerarch,
• oberarch,
• overatch,
• overarc,
• overrach,
• everytch,
• myrairch,
• overmarc,
• ovematch,
• overpartt,
• overprech,
• Overparch,
• Overcearch,
• overwaryy

• overarm,
• overhear,
• over here,
• overwork,
• overwrought.

The adverb form of "overarch" is "overarchingly".

The adjective form of the word "overarch" is "overarching".

The plural form of "overarch" is "overarches".

The singular form of the word "overarch" is "overarch". It is already in its singular form.