I.on [美 ɑn, ɔn, 英 ɒn]介词on often appears as the second element of certain verb structures in English (count on, lay on, sign on, etc). For translations, see the relevant verb entry (count, lay, sign, etc).
Whereas the literary character was quite verbose and could carry on long conversations with the other characters, the cinematic version's discourses are more limited, consisting mainly of threats or boasts.