1mus·ter 
/ˈmʌstɚ/ verb
mus·ters; mus·tered; mus·ter·ing /ˈmʌstɚ/ verb 1 [+ obj] : to work hard to find or get (courage, support, etc.)
▪ They pushed the car with all the strength they could muster. ▪ He finally mustered (up) the courage to ask her on a date. ▪ The country's leaders have been trying to muster (up) support for the war. ▪ They mustered (up) the 20 votes needed to pass the law. 2 : to gather together (a group of people, soldiers, etc.) especially for battle or war [+ obj] ▪ muster an army [no obj] ▪ The soldiers mustered [=gathered] in the center of town.
▪ They pushed the car with all the strength they could muster. ▪ He finally mustered (up) the courage to ask her on a date. ▪ The country's leaders have been trying to muster (up) support for the war. ▪ They mustered (up) the 20 votes needed to pass the law.
