Most grass varieties go dormant when watered infrequently. They don’t necessarily go dead. Cool-season grasses go dormant to protect themselves during long, hot periods when they do not have enough water to remain in an active growth phase. Warm-season grasses go dormant in cold weather, when they die back naturally.
In both cases, the grasses' crowns remain alive and, in hot situations, water may revive the grasses. It is possible, however, for weather to get so hot that no amount of water helps. This is a special concern in our arid environment. But don’t worry: Dormancy is a natural, built-in protection mechanism. Your grass probably will return when the weather cools in the fall.