to reason earnestly with someone against something that person intends to do or has done; remonstrate: His father expostulated with him about the evils of gambling.
Origin: 1525–35; < L expostulātus demanded urgently, required (ptp. of expostulāre). See ex-1, postulate
c.1534, "to demand, to claim," from L. expostulatus, pp. of expostulare "to demand urgently, remonstrate," from ex- intensive prefix + postulare "to demand." Friendlier sense is first recorded in Eng. 1574.
[ik-spos-chuh-leyt] 
tʃəˌleɪt