to be afraid, to feel fear in the face of danger or threat.
This is the everyday sense of fear: dread in the face of a person, an army, an enemy, or a frightening situation. The one who fears is smaller, weaker, or outnumbered, and the body knows it. The word appears most often in the pattern "do not be afraid", soldiers told not to fear the enemy, Israel told not to fear the nations of Canaan, individuals reassured when an angel appears. The reassurance only makes sense if the fear is real fright, not reverence.
This fear can be appropriate or not. Soldiers were sometimes told their fear was right (1 Samuel 17:11, the whole army recoiled from Goliath, and the narrator does not condemn them); they were also told to set it aside and fight. What distinguishes this sense from the reverence sense is the object: here the thing feared is a threat, never a holy person or place deserving honor.