Translation according to P. W. Joyce:
Crummagh in Galway, and Crummy in Fermanagh and Leitrim; Cromach, sloping land. See Crom, vol. ii. p. 422 [reproduced below].
Bends and Slopes. Crom means bent, inclined, stooped, or crooked. It is a term of very common occurrence in local names, but many of those of which it forms a part have been already examined. In anglicised names it usually takes the forms crom and crum, and occasionally crim. One of the peaks of the Mourne range is called Bencrom, stooped mountain. Macroom in Cork is written in the Irish authorities Magh-cromtha [Macromha]; the latter part is the genitive of the participial form cromadh; and the whole name means the sloped or inclining field or plain; which accurately describes the spot on which the town stands, for it is a slope at the base fo Sleveen hill. The name corresponds with that of Cromaghy, a place near the village of Rosslea in Fermanagh - sloping field. Cromane and Cromoge, two diminutives, signify anything sloping or bending, and give names to many places; whether they are applied to glens, hills, fields etc., must be determined by the character of the particular spot in each case. Sometimes they are applied to streams, as in the case of the Crummoge, a rivulet a little south of Borrisoleigh in Tipperary, which, like Loobagh, (p. 424) received its name from its sinuous course.