I think you could say you were expanding your collection of candles. That sounds very natural to me. I don't think I would say that.
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Gene93. Is there a significant difference in meaning?I see none, really. If I used 'expand', it would be a bit more pompous, so perhaps I already have an impressive collection.
Gene93What do you think, Mr Micawber? Are they different with respect to amount, numbers, etc?I think the number added is irrelevant. Of course, if you've only expanded your collection by one item, you probably would not be tempted to mention it at all...unless you are collecting antique automobiles.