Third times a charm:
After no success the first two times, the third try is a
lucky one.
Tie the knot:
To get married.
Til the cows come home:
A long time.
To Make A Long Story Short:
Something someone would say during a long and boring
story in order to keep his/her audience from losing
attention. Usually the story isn't shortened.
To Steal Someone's Thunder:
To take the credit for something someone else did.