あの臆病者の鼻をあかしてやった。

that (someone or something distant from both speaker and listener, or situation unfamiliar to both speaker and listener)

coward

indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question

nose

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to bore; to tire; to weary; to stultify; to use lavishly (and without regret)