Shift left (right) logical

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 SHIFT LEFT (RIGHT) LOGICAL [from any of various machines' instruction
       sets] 1. v. To move oneself to the left (right). To move out of the
       way. 2. imper. Get out of that (my) seat! Usage: often used without
       the "logical", or as "left shift" instead of
       "shift left". Sometimes heard as LSH (lish), from the PDP-10
       instruction set.