accident waiting to happen
A thing or situation which is almost certain to eventually lead to an accident.
Someone needs to repair that worn-out old bridge. It's an accident waiting to happen!
ADJ.
all, awful, chemical, good, outside, over, used
The waiting was over and we finally got the keys to our new house.
VERB + WAITING
found, kept, stood, use, wait
I kept waiting for the bus, but it never arrived that afternoon.
WAITING + NOUN
bus, day, earth, everything, gerund, hours, news, room
I spent three hours waiting for the bus in the rain this morning.
PREP.
after, in, in, until, without
I've been waiting in line for over an hour to buy concert tickets.