percumbo

ο φίλος τον φίλον εν πόνοις και κινδύνοις ου λείπει → a friend does not abandon his friend in difficulties and in danger, a friend in need is a friend indeed

Latin > English (Lewis & Short)

per-cumbo: cŭbŭi, 3, v. n., mentioned as an unused form, Varr. L. L. 9, § 49 Müll.