grč

1. cramp; spasm
   Dok sam plivala, uhvatio me grč u nozi. — While I was swimming, I got a cramp in my leg.
   Beba noću plače zbog grčeva u stomaku. — The baby cries at night because of tummy cramps.
2. (of nerves, in play) tension; nervous tightness
   Naši igrači su u prvom poluvremenu igrali u grču. — Our players were tense and tight in the first half.
   Pred ispit osećam grč u stomaku. — Before the exam I get a knot in my stomach.

The usual phrase is uhvatio me grč — "I got a cramp".