This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
逪 combines 辶 (movement) with 昔 (old times). The exact historical development is uncertain, but it likely relates to going against or mixing, based on its associated readings.
The movement radical 辶 wraps around 昔 (old times). Picture old paths crossing and mixing, leading to confusion and rebellion.
For サク, imagine an old sack (サク) of mixed paths spilling out, causing disorder: sack -> サク.