the bony structure in a fish that supports its body

an issue or problem that is central to a disagreement

एक मुद्दा या समस्या जो किसी असहमति का केंद्रीय बिंदु है

English Usage: The fishbone of the argument was their different views on the project.

Hindi Usage: विवाद का मछली की हड्डी उनके प्रोजेक्ट पर भिन्न दृष्टिकोण थे।