Fine print is an expression used to describe small text in contracts and advertisements which is often purposefully small in order to conceal or hide information. (noun)
An example of fine print is the 10 pages of teeny tiny text at the end of your cell phone contract.
An example of fine print is the tiny warning about side effects on the screen for a new drug ad.
See fine print in Webster's New World College Dictionary
a section of a document, as a contract, warranty, or advertisement, in smaller print than the main body: although it includes additional conditions, limits, etc., this section may not be read carefully because it is typically terse or in legalese
any additional details, conditions, etc. regarded as obscure or, often, deliberately obscure
See fine print in American Heritage Dictionary 4
(fīn)
noun In both senses also called small print.
The portion of a document, especially a contract, that contains qualifications or restrictions in small type or obscure language.
Something presented in a deliberately ambiguous or obscure manner.