sweep account
noun[C]
BANKING,FINANCEukusabankaccountthatautomaticallytransfersmoneyinto anotheraccountorinvestmentthatpayshigherinterestwhen theamountofmoneyin it goes over aparticularlevel:
Sweepaccountsallowsmallbusinessesto gethigherreturnsoncashthat mightotherwisebe doing nothing in acurrentaccount.