• construct, build (something new); publicize, advertise, bring to the attention of the public, promote; intensify, strengthen, increase
• a build-up of something is a gradual increase in it.
• the build-up to an important event is the period of time immediately before the event and the preparations that take place during that time.
build up a deficit
• gradually increase a deficit, regularly spend in excess of one's income
build up one's health
• improve one's well-being, improve one's condition, improve one's health