He added: 'This is a very darkhour for our party but we cannot and will not allow decent liberal values to be extinguished overnight'.
The Sun (2015)
Definition of 'hour'
hour
(aʊəʳ)Explore 'hour' in the dictionary
countable noun
If you refer, for example, to someone's hour of need or hourof happiness, you are referring to the time in their life when they are or were experiencingthat condition or feeling.
[literary]
Definition of 'dark'
dark
(dɑːʳk)Explore 'dark' in the dictionary
adjective [usually ADJECTIVE noun]
A dark period of time is unpleasant or frightening.