1. (

• strengthen ,
• beef_up ,
• fortify ,

) make strong or stronger; "This exercise will strengthen your upper body"; "strengthen the relations between the two countries" ;

2. (

• fortify ,
• fort

) enclose by or as if by a fortification ;

3. (

• arm ,
• build_up ,
• fortify ,
• gird

) 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" ;

4. (

• fortify ,

) add nutrients to; "fortified milk" ;

5. (

• spike ,
• lace ,
• fortify

) add alcohol to (beverages); "the punch is spiked!" ;