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This becomes a bone spur. When the bone spur grows out of one of the joints on the top of the midfoot, it's called a tarsal boss. A bone spur on the inside or outside any of the toes is usually referred to as a toe spur. Any factor that creates too much friction within the foot can lead to a tarsal boss or toe spur.
The context is below. Bansal is the famous coaching center to clear Engineering Entrance test. Bansal students had a chip on their shoulder, even though they weren't technically even in a college. The meaning for the phrase chip on their shoulder is a form of physical challenge, inviting opponents to knock the chip off and so provoke a fight. I can understand its meaning refers to they are so much alert to face any question or puzzle related to engineering entrance test.