(informal) a spineless coward, wimp, or good-for-nothing; used as a derogatory term for someone who is timid, weak, and incompetent

Frustration or petty annoyances caused by unfair treatment or bullying which one is unable to vent or express; humiliation or grievances that one is forced to endure.

popliteal cyst; a fluid-filled swelling that develops at the back of the knee