Parallelism (grammar)
In a parallelism, a first statement often will be repeated in other words by the second statement. These other words often add to the meaning of the first statement. For example, "The winter winds blow hard. The cold air pushes us back." In the second sentence, "cold air" is parallel to "winter winds", and "pushes us back" is parallel to "blow hard" (it is what the winter winds do).