English Dictionary

foreshock

noun

(geology) A small earth tremor which precedes the mainshock in an earthquake sequence. Not all mainshocks have foreshocks. / Any shock or disturbance which precedes an event

The foreshock rattled the windows and sent everyone into a panic.

意味（1）

(geology) A small earth tremor which precedes the mainshock in an earthquake sequence. Not all mainshocks have foreshocks.

意味（2）

Any shock or disturbance which precedes an event

The FY 1981 increases in defense — something of a foreshock to the rapid rise in defense spending over the next several years — were prompted by the fall of the Shah in Iran and the Soviet invasion of Afghanistan.