(èn, ㄣˋ) (nonverbal grunt as interjection); OK, yeah; what? [CE-DICT]
(en, ㄣ˙) interjection indicating approval, appreciation or agreement [CE-DICT]
挺
(ちょう) (ctr) counter for long and narrow things such as guns, scissors, spades, hoes, inksticks, palanquins, candles, jinrikishas, shamisen, oars, etc. [EDICT]
(tǐng, ㄊㄧㄥˇ) straight and stiff; rather (good); quite; very; classifier for guns or machinery [CE-DICT]