Eights represent balance, movement, order, change, giving and receiving.

Eight of Wands - Energy, movement, activity, speed, things happening quickly, swiftness
Eight of Cups - Withdrawal, retreat, turning your back on something and moving off into a different direction, abandoned success
Eight of Swords - Restriction, feeling blocked, feeling ganged up on or attacked, frustration, waiting, shortened force
Eight of Pentacles - Craftsmanship, productivity, putting your affairs in order, mastery, being busy, prudence