#1 build up v. enlarge, develop, or increase by degrees or in stages; "build up your savings". wn
#2 build up v. form or accumulate steadily; "Resistance to the manager's plan built up quickly"; "Pressure is building up at the Indian-Pakistani border". wn
#3 build up v. prepare oneself for a military confrontation; "The U.S. is girding for a conflict in the Middle East"; "troops are building up on the Iraqi border". wn
#4 build up v. bolster or strengthen; "We worked up courage"; "build up confidence"; "ramp up security in the airports". wn
#5 build up v. change the use of and make available or usable; "develop land"; "The country developed its natural resources"; "The remote areas of the country were gradually built up". wn
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