The meaning is that it is the right time to do something.
very drunk. By the time the party was over, he was cork high and bottle deep.
Very, very small.
The idiom 'sands of time' refers to the inexorable forward movement of time. It refers directly to the sand running through an hourglass.
"To be" is not an idiom - it's a verb.
The origin of this idiom seem to be from old radio slang, with "five by five" meaning "loud and clear." The idiom basically means that everything is okay... everything is cool, bro'. To read more about this idiom in the Urban Dictionary, see the Related Link.
very drunk. By the time the party was over, he was cork high and bottle deep.
important parts
Very, very small.
Nothing. The correct idiom is "get OFF your high horse," meaning stop acting so conceited as if you are above everyone else.
Having fun;Great time
It's not an idiom - it means just what it says. Something took "no" time to come about. It's an exaggeration, but the meaning is plain.
The idiom 'sands of time' refers to the inexorable forward movement of time. It refers directly to the sand running through an hourglass.
The idiom 'on the dot' means at a precise time or right on time.
It means precisely at that time - no earlier or later.
You would need an entire encyclopedia to list every single idiom and its meaning. You may ask the meaning and origin of one at a time however.
This isn't an idiom. It means just what it seems to mean. Something is only a matter of time - you only have to wait until it happens.
"To be" is not an idiom - it's a verb.