Deepen, stabilize and sustain established international relations. As the bacteria continues its colonization, the canker will deepen and expand. Shortly thereafter, vigorous deep convection developed, allowing the storm to deepen further. They take both sides of an issue to deepen the political divide. This served to deepen his depression and isolated him even further. However, expressing one's anger toward God can deepen the relationship. They deepen gradually in the summer months depending on the temperature variance. This incident appeared to deepen the animosity between them. As development progresses, the lens placode begins to deepen and invaginate. This helps deepen the landscape by adding layers. The flood widened Hells Canyon but did not deepen it. The system moved towards Ireland and began to deepen. These students deepen their practical experience by working at these organizations. As the child matures, the color may deepen to a dark red or purplish color. As Andrews aged, so did her voice, which began to naturally deepen.