This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Simple past and past participle of entreat.

"She wrote to him, and in the tenderest terms entreated he would reconcile himself to what was past, and as a consolation, to be thankful what he had so much feared had not happened, that she lived, and would never bring reproach on him; beseeched him, as he valued her peace of mind, not to think on her with regret, but to rejoice in her happiness."

entreated    entreating    entreats   

plead   

beg    implore    solicit    beseech    supplicate