Sentence:  When the fate of the individual is visited on the group , then ( the warm sweet butter dripped from her raised <WSD>trembling</WSD> fork and she pushed her head forward belligerently ) , ah , then the true bitterness of existence could be tasted . 
Meaning of the word marked with <WSD> tags:  vibrating slightly and irregularly; as e.g. with fear or cold or like the leaves of an aspen in a breeze