earthquake UK /ˈɜːθkweɪk/US /ˈɝθkweɪk/noun 3verb 1forms 3 noun3 •a strong movement of the ground that shakes buildings, happening when rock deep below suddenly breaksHer alablaster brest she soft did kis, / Which all that while shee felt to pant and quake, / As it an Earth-quake were: at last she thus bespake. — 1590 •Such a quake specifically occurring on the planet Earth, as opposed to other celestial bodies.The wave patterns, too, are strikingly different: The secondary (S) waves and surface waves on lunar seismograms are not generally as clearly defined and distinct as are those of earthquakes. — 2006 •(figurative) A sudden and intense upheaval; a severely disruptive event. verb1 •To undergo an earthquake.Watch the Philippines very closely for the next little while. There is rumbling and earthquaking deep within Pinatubo and increased earthquaking within Mayon. — 1993 formsearthquaked · earthquaking · earthquakes