Definition of twenty-four-hour clock in English:

twenty-four-hour clock

Syllabification: twen·ty-four-hour clock
(also 24-hour clock)

noun

A method of measuring the time based on the full twenty-four hours of the day, rather than dividing it into two groups of twelve hours.

Definition of twenty-four-hour clock in:

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Word of the day demoralize
Pronunciation: dɪˈmɒrəlʌɪz
verb
cause (someone) to lose confidence or hope