1> A Fly in the ointment : a small defect that spoils something valuable or is a source of annoyance; something unpleasant that has come to light in a condition that is almost too pleasing
Ex. The only fly in the ointment was my father who was against my love marriage.

2> Adam's ale : humorous way to refer to "water" as it was the only drink available to Adam (the first man on planet Earth)
Ex. They went up the hill to fetch a pail of Adam's ale.

3> Sail close to the wind : to do something that is dangerous and/or that may not be legal or acceptable.
Ex.(a) She realized she was sailing a little too close to the wind and decided to tone down her criticism.
Ex.(b) We thought she was sailing a bit close to the wind in her business deals, but she claimed everything was legal.

4> Put the last hand : to make the last corrections in; to perfect; to complete
Ex. The seminar report was almost ready.We just had to put the last hand in it.

5> The sand has run out : (Usually, "The sands of time are running out") It is Used to say that there is not much time left to do something.
This idiom has derived its meaning and sense from the fact that, In a sand-glass (also known as sand-timer or sand-clock), the sand trickles from the top to the bottom, indicating the passage of time.
Ex. The Examiner said,"Stop writing. Put your pen down. The sand of time has run out!".