a sure-fire method

a Determinative

— A is used when the following word could be any of a certain type. Compare "A book I saw on the shelf" and "The book I gave you yesterday".

a Noun

— A is the first letter of the alphabet. The letter "a" comes before "b". — In some schools, an A is a very high grade. Ron got an A on his earth science test.

sure Adjective

— When you are sure about something, you are certain. The student was sure that his answer was correct.

fire Noun

— A chemical reaction that makes heat and flames or smoldering. — Something that has made or can make this chemical reaction, such as a campfire. We sat around the fire singing songs and telling stories. — The, often accidental, occurrence of fire in a certain place which leads to its full or partial destruction. There was a fire at the school last night and the whole place burned down. — One of the four basic elements. — One of the five basic elements.

fire Verb

— To set something on fire. — To shoot (a gun, cannon or a similar weapon). We will fire our guns at the enemy. — To shoot a gun, cannon or a similar weapon. Don't fire until you see the whites of their eyes. — To end the employment of an employee because of something they did wrong. She should fire the employee that stole from the company. He got fired from his job.

method Noun

— If you use a method to achieve a goal, then you use a planned process. It is quite simple to use the method described in Section 7.2 to find the solution. My preferred method for contacting friends overseas is on the Internet.