It means to raise something mechanically, like a flag
[DOC] [TLE] Raise | Define Raise at Dictionary.com [PAR] Raise definition, to move to a higher position; lift up; elevate: to raise one's hand; 
sleepy ... to increase the amount specified in (a check, money order, or the like) 
by ... Hoist implies lifting slowly and gradually something of considerable weight, 
usually with mechanical help, such ...