Even though she wanted to argue, she forbore from speaking out.

forbore 是动词 forbear 的过去式。forbear 由前缀 for-（表示"克制、禁止"）和 bear（"忍受"）组成，意思是"克制、忍耐、忍住不做某事"。在句中表示"忍住没说出口"的动作。