A particular quivering sound of the silver trumpets to give warning to the Hebrews on their journey through the wilderness (Numbers 10:5, 6), a call to arms, or a war-note (Jeremiah 4:19; 49:2; Zephaniah 1:16).

Noah Webster's New International Dictionary of the English Language

1. (n.) A summons to arms, as on the approach of an enemy.

2. (n.) Any sound or information intended to give notice of approaching danger; a warning sound to arouse attention; a warning of danger.

3. (n.) A sudden attack; disturbance; broil.

4. (n.) Sudden surprise with fear or terror excited by apprehension of danger; in the military use, commonly, sudden apprehension of being attacked by surprise.

5. (n.) A mechanical contrivance for awaking persons from sleep, or rousing their attention; an alarum.

6. (v. t.) To call to arms for defense; to give notice to (any one) of approaching danger; to rouse to vigilance and action; to put on the alert.

7. (v. t.) To keep in excitement; to disturb.

8. (v. t.) To surprise with apprehension of danger; to fill with anxiety in regard to threatening evil; to excite with sudden fear.