Earlier quoted context omitted.
Sure, but at some point, you have to be told what "duck, cover, hold" actually means. Your comment as the first comment someone hears is like a news article using acronyms throughout the article without ever expanding the acronym.
It's relatively self-explanatory. The full expansion would be " Duck under a table or other rigid object. Cover your head. Hold on."
DROP or DUCK down to your hands and knees
Take COVER protecting your head/neck with an arm and crawl under a sturdy table/desk possible or to a nearby interior wall away from potential falling objects
HOLD ON to your shelter if you have it or head/neck with both hands if you don't
It's not as obvious as stop, drop and roll which is why drills are a thing in schools.
It's also not terribly far from duck and cover drills for nukes or tornadoes as I understand it. The hold on bit was added to keep people from tripping and breaking a leg while running around while the ground is shaking.