To protect from danger; to secure against surprise, attack, or injury; to keep in safety; to defend.

To keep watch over, in order to prevent escape or restrain from acts of violence, or the like.

“Guard the prisoner.”

To watch by way of caution or defense; to be caution; to be in a state or position of defense or safety.

“Careful people guard against mistakes.”

Cautious; restrained.

Watched over; supervised.

Not favourable.

“guarded prognosis”