Verb
1. make strong or stronger;
"This exercise will strengthen your upper body""strenghten the relations between the two countries"2. enclose by or as if by a fortification
3. prepare oneself for a military confrontation;
"The U.S. is girding for a conflict in the Middle East""troops are building up on the Iraqui border"4. add nutrients to;
"fortified milk"5. add alcohol beverages