Tautological expressions or what Maverick Philosopher http://maverickphilosopher.powerblogs.com refers to as non-tautological propositions - Tautology2 - http://maverickphilosopher.typepad.com/maverick_philosopher/2010/01/when-is-a-tautology-not-a-tautology.html. A http://en.wikipedia.org/wiki/Pleonasm (Pleonasm) is in reality a tautological2 expression and specifically not a manifestation of http://en.wikipedia.org/wiki/Tautology_(rhetoric)3.
A Tautological2 expression or Pleonasm2 aids in achieving a specific linguistic effect, be it social, poetic, or literary. In particular, pleonasm sometimes serves the same function as rhetorical repetition — it can be used to reinforce an idea, contention or question, rendering writing clearer and easier to understand. Such Pleonasms can be found in the book of Psalms.
Is the contention that "free gift2" is a tautology1,2 or 3? true? . To assert that such a phrase always says the same thing twice is to miss-frame the particular premise of a user. For example: A man's gift of a dinner and a movie to his date may be a "gift2" but it sometimes comes bundled with expectations. But, if the recipient of the free dinner asks first "if I go with you, are you expecting anything?" and gets the answer "no", then it's accurate to say the invitee got a "free gift" of dinner. It is incorrect that no gift can ever have non-free implications attached to it.
Another example is "suddenly, without warning". If two armies oppose each other in the field and one commander sends the opposition a warning message as follows "I instruct you to retreat or I will attack", any subsequent attack, sudden or otherwise, was warned. "Sudden" means "happening or coming unexpectedly". But students of military history have noted; via effective deception, any attack can be seen as "sudden", even if fair warning was previously given.