un- + stick
unstick (third-person singular simple present unsticks, present participle unsticking, simple past and past participle unstuck)
- (transitive, sometimes figuratively) To free from the condition of being stuck.
2012, Laura Pazzaglia, The Everything Healthy Pressure Cooker Cookbook:
Add the rice and sauté until the first few grains begin to brown (about 3 minutes). Add peas, stock, and salt. Mix well and be sure to scrape the bottom of the pan to unstick any rice.