緊張を和らげる reduce tension
緊張度が増す increase the tension level
緊張の高まり building up of tension
緊張感 feeling of tension
緊張緩和 easing of tension
試験の前は緊張する become nervous before an examination
初めての舞台なのでとても緊張している。 I am very nervous as this is my first stage performance.
二国間関係が緊張する。 Relations between the two countries become tense.