This is the 5464th most frequent Turkish word.
maaşını
"His/her salary" or "his/her wage."
The word 'maaşını' applies a possessive suffix and the accusative case to indicate 'his salary' being the direct object of the verb.
Ali maaşını dün aldı.
Ali received his salary yesterday.
Here, 'maaşını' again uses the possessive suffix and the accusative case, expressing 'his salary' as something acted upon.
Ali maaşını bir saatte harcadı.
Ali spent his salary in an hour.
In this instance, 'maaşını' denotes possession and shows that the object of saving is 'his salary'.