This is the 10954th most frequent Turkish word.
dilimleyip
"By slicing" or "slicing."
Here, 'dilimleyip' describes the slicing of the bread as the first action preceding offering it to friends.
Ekmeği dilimleyip arkadaşlarıma sundum.
I sliced the bread and offered it to my friends.
The word 'dilimleyip' is used here to indicate the action of slicing the apple before performing the next action, which is putting it on the plate.
Elmayı dilimleyip tabağa koydum.
I sliced the apple and put it on the plate.
In this sentence, 'dilimleyip' conveys the action of slicing the onion as a step before adding it into the dish.