и́з-за
preposition
from behind
GEN
something
because of, owing to, on account of; over; through
GEN
something
из-за́ неосторо́жности
through carelessness
because of, over
и́з-за кого́?
because of whom?
и́з-за чего́?
because of what?
и́з-за э́того
because of this
Разошли́сь и́з-за пустяко́в.
We/they split up over a trifle.