Taras means to stand in the style of a wall, each brick of which is interlocked with another so much so that there is not even the slightest gap between two of its bricks. When people array themselves for Salat, they should keep their feet and shoulders so close with one another on their left and right that there is no gap or space between them. Moreover, the front rows should be completed first. One should never take place in the second row if there is place in the first. Similarly, one should never take place in the third row if there is room in the second line. And so on and so forth.