1. Laying Plans
This is probably the meaning though Mei Yao-ch`en has the note: "while we are taking our ease, wait for the enemy to tire himself out." The YU LAN has "Lure him on and tire him out."
If his forces are united, separate them.
Less plausible is the interpretation favored by most of the commentators: "If sovereign and subject are in accord, put division between them."