to ask (somebody) urgently or earnestly; to beg or plead with (somebody)
to request (something) urgently or earnestly
I have come to entreat your help
archaic to treat or deal with (something or somebody)
to make an urgent or earnest request; to plead
entreatingly adv
entreatment noun
[Middle English entreten from early French entraitier, from en-1 + traitier: see treat1]