hole-in-the-wall \ˈ ̷ ̷ ̷ ̷ ̷ ̷| ̷ ̷\noun (pluralholes-in-the-wall) : a small and insignificant place especially difficult to locate < in the jewelry business and ran a hole-in-the-wall you could barely squeeze into > < a hole-in-the-wall patent-medicine manufacturer >