뜨자

In a sentence

• 해가 뜨자 새로운 하루가 시작되었다.

  As the sun rose, a new day began.

  In this sentence, '뜨자' is used to indicate the event of the sun rising, specifically, the conjunction '-자' is attached to '뜨다' to denote a causal relationship.

• 물이 뜨자 아이들은 놀라서 물러났다.

  As the water floated up, the children stepped back in surprise.

  Here, '뜨자' refers to the water floating upwards, showing its rising motion. Similar to the previous sentence, '-자' implies a causal sequence.

• 심장이 뜨자 긴장감이 더욱 고조되었다.

  As the heart raced, the tension heightened.

  In this context, '뜨자' metaphorically expresses the increased intensity or pace of the heartbeats, once again combined with '-자' for expressing causality.