ask (someone) to marry you; "he popped the question on Sunday night"; "she proposed marriage to the man she had known for only two months"; "The old bachelor finally declared himself to the young woman"
enlarge, develop, or increase by degrees or in stages; "build up your savings"
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"
form or accumulate steadily; "Resistance to the manager's plan built up quickly"; "Pressure is building up at the Indian-Pakistani border"
bolster or strengthen; "We worked up courage"; "build up confidence"; "ramp up security in the airports"