From Proto-Italic *karpō, from Proto-Indo-European *kerp-. Cognate with Old Church Slavonic чрѣти (črěti, “to draw, scoop”). Also compare Greek καρπός (karpós, “fruit”) and κείρω (keírō, “to cut off”), English harvest, sharp, shear.
Practice speaking and memorizing "carpo" and many other words and sentences in Latin.