soft touch

n.
One who is easily persuaded or taken advantage of.

Someone easily persuaded or taken advantage of, especially in giving away money. For example, Ask Dan for the money; he's always a soft touch. [First half of 1900s]

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The noun has one meaning:

Meaning #1: a person who is gullible and easy to take advantage of
  Synonyms: chump, fool, gull, mark, patsy, fall guy, sucker, schlemiel, shlemiel, mug

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