Entry 2 senses · 2 variants Webster, 1913 Crup /(kr?p)/ · IPA /kɹʌp/ a. n. 01 a. Short; brittle; as, crup cake. 1. Short; brittle; as, crup cake. 02 n. See Croup, the rump of a horse. 1. See Croup, the rump of a horse. See: Croup