Sentence:  In carrying out a spending plan, accounts are usually most important for controlling small recurring expenditures as for newspapers, magazines, tobacco, movies, soft drinks, ice cream, and meals eaten out. Many families look upon these as incidentals and may treat them as unimportant. But they may be <WSD>nibblers</WSD>, eating away day by day money that is wanted for other things. 
Meaning of the word marked with <WSD> tags:  Someone who nibbles.