The enemy forces are getting restless; we must strengthen our defenses.
Tips
memory
蠢蠢 (wriggling, like insects) + 欲动 (about to move) — picture insects wriggling under the soil, ready to emerge. Something is stirring and about to burst into action.
usage
Can be positive (spring awakening, eager anticipation) or negative (enemies preparing to attack, troublemakers getting restless). Context determines the tone.