play on
1. To cause an effect on; influence.
A heavy diet of television drama played on his feelings.
2. To work upon for a planned effect; excite to a desired action by cunning plans; manage.
The makeup salesman played on the woman's wish to look beautiful.
In some places, leaders play upon people's superstitious fears.
He played on the man's ambition and love of honor.
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Source: A Dictionary of American Idioms
