webster's new world college dictionary says
'life' 13 the source of vigor or liveliness [the life of the party]
Is it right for me to interpret that into [the party produces a vigorous mood / they are in a mood of liveliness because of the party] i.e., The party is a cause and life a result... Am I clear?
No. Consider this example, She was the life of the party. Here, "life" roughly means star" of the party.
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No. Consider this example,
She was the life of the party.
Here, "life" roughly means star" of the party.