high time

noun
the appropriate time or past the appropriate time: It's high time he got out of bed.
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World English Dictionary
high time
 
adv
1.  the latest possible time; a time that is almost too late: it's high time you mended this shelf
 
n
2.  Also called: high old time an enjoyable and exciting time

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Idioms & Phrases

high time

The appropriate time for something; also, past the appropriate time. For example, It's high time we did something about Martha's dog, or It's high time you children were in bed. The precise meaning of this term depends on the tone of voice and/or the context. For a synonym, see about time.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
It is now high time that these principles are applied to the design and
  building of our human future in space.
It's high time that humans expanded their horizons and explored the solar
  system.
It's high time for an era of research that takes the extra step so that drugs
  can be better matched to individuals.
It was high time to upgrade to a later release anyway.
Idioms & Phrases
Synonyms
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