The term "boost" has several meanings, depending on its context. Generally speaking, it refers to something that gives a positive or negative increase to an existing quantity or value. Here are some common definitions and uses of the word "boost":
1) To give someone or something support, encouragement, or confidence: "The coach's speech boosted the team's morale."
2) To enhance or improve something by adding extra features or qualities to it: "The new smartphone model has a faster processor and better camera, which will surely boost its sales."
3) To increase the power of an electrical signal: "The amplifier is designed to boost weak signals so that they can be transmitted over long distances."
4) To raise or elevate something to a higher level: "The government's new policy aims to boost economic growth through investment in infrastructure projects."
5) To increase the speed of an aircraft or rocket by using additional power from engines, rockets, or other means.