And there I thought my English was not too bad ...
But reading this, what IS the exact difference between a city and a town? I thought towns were a bit smaller, but is there really a sharp distinction?
(Off topic, just in case someone finds this interesting: In German there is only "Stadt", and if a community is a "Stadt" is a purely legal definition nowadays. In former times it was important if the thing was walled or not, as the wall made it a proper city.)
"olmak" is "to become" and "etmek" is "to make, to do".
Hence, from "kayıp" (loss), we get "kaybolmak" (to get lost, to become lost) and "kaybetmek" (to lose).
So if you lose something in the city, you "kaybetmek" it. (And the item itself "kaybolmak"s.)
And if you yourself get lost, then you also "kaybolmak".