In a word = briefly ; ( said when you are about to give your opinion in a short ,direct way).

• In a word, she’s lying.
• A:  Shouldn’t he be given the leading role?
• B:  In a word – No.

Small/fine print = the rules , restrictions and conditions which are often written in very small letters and they are usually printed smaller than the rest of the text.

• Don’t sign anything until you have read the small print.
• Read the small print in your contract to find out exactly what you are insured for.
• It is important to read the small print before parting with your money.

A tall order = a task, job ,request or favour which is not reasonable.  A tall order is hard to accomplish , and it might even be impossible.

• Even for a bodybuilder , lifting 500 pounds is a tall order.
• Building the bridge in time for Olympics will be a tall order.
• To score four goals in one game is a tall order, even for him.