The phrase "huge shock" means being very surprised or startled by something that was unexpected.
Sentences with «huge shock»
So it came as huge shock when he was weighed on day ten and he had gone down from 8 lbs 4 oz to 6. (breastfeedingmums.com)
Where this shift wasn't as huge a shock for Zelda in Hyrule Warriors, Fire Emblem Warriors is a massive change for the series» standard, and one for the best. (gameluster.com)
When the charges explode, they send out huge shock waves that nearly shake Obi - Wan apart. (discovermagazine.com)