To stand on side line means, you're just a follower. Also, it means that you're not a leader, just a helper.
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Do you mean, like, the Earth? The equator. If you mean the line going from side to side across the middle of a circle then... the diameter of a circle
High side and low side refer to the pressure in the ac system. Ie The high side is the high pressure line and low side is the low pressure line.
The S's stand for side-side-side.
side side side
Side, side, side