petition humbly; beg to grant a favor
That professor is a harsh marker: after every examination, there is a crowd of desperate looking students outside her office, waiting to supplicate her.
sub (under, up to)#placare (to calm, appease) (Latin)
entreat, importune, solicit, supplicate
if you SUPPLICATE God will SUPPLY supplicate, suppliant, supple, supplicant are all related terms.