Sentence:  When Dangerfield put the little roll in his hand, Irons looked suspicious and frightened, and balanced it in his palm, as if he had thoughts of chucking it from him, as though it were literally a satanic <WSD>douceur</WSD>. But it is hard to part with money, and Irons, though he still looked cowed and unhappy, put the money into his breeches' pocket, and he made a queer bow ... 
Meaning of the word marked with <WSD> tags:  A sweetener: a gift offered to sweeten another's attitude, a tip or bribe.