Denshi Jisho — Online Japanese dictionary

奢る おごる 1: to give (someone) a treat;
2: () to be extravagant; to live luxuriously;
3: to be proud; to be haughty
Common word, Godan verb with ru ending, Transitive verb 
奢る平家久しからず おごるへいけひさしからず pride goes before a fall; lit: the proud Heike family lasts not long
Expression 

You can also

Look up kanji details for 奢る.

Try a Yahoo Jisho search for 奢る .
Try a Goo Jisho search for 奢る .
Try a Google search for 奢る .