Learn Turkish: İşini kaybetmek pahasına bu büyük yolsuzluğu ifşa etti. - He exposed this massive corruption at the cost of losing his job.

The word paha means "price" or "value." By adding the third-person possessive -sı, the buffer -n-, and the dative case -a (meaning "to" or "at"), we get pahasına ("at the price of" or "at the cost of"). When combined with a full infinitive verb like kaybetmek (to lose), the whole phrase kaybetmek pahasına means "at the cost of losing."

Why does işini have two -i endings?

The first -i is the third-person possessive suffix, meaning "his" (his job = işi). The second -i is the accusative case marker, which is required because "his job" is the specific direct object of the verb kaybetmek (to lose). The -n- in between is a buffer letter used when adding a case ending to a possessive suffix.

Why is the word for corruption, yolsuzluk, spelled as yolsuzluğu here?

Because he is exposing a specific corruption ("this massive corruption"), the word takes the specific direct object (accusative) ending -u. Adding a vowel suffix to a noun ending in -k causes consonant mutation, changing the hard -k to a soft -ğ-.

Is ifşa etti a compound verb?