against the clock

meaning:if you work against the clock, you are trying very hard to finish something before a deadlineuse:Police are working against the clock to find the evidence they need.

2around the clock

meaning:all day and all nightuse:The nurses worked around the clock to look after the injured child.

3back in the daymeaning:a time in the past; used mostly when you are remembering nice thingsuse:My parents say Hong Kong’s pollution wasn’t a problem back in the day, and the sky was always blue.

4behind the timesmeaning:old-fashioned; not modernuse:Anyone who isn’t on Snapchat is behind the times and needs to catch up!

5call it a day/night

meaning:decide that you have finished doing something for nowuse:We’ve been working on this project since 6am. Let’s call it a day, and finish it tomorrow.

6crunch timemeaning:a point at which something difficult must be doneuse:The elections have been entertaining, but now it’s crunch time, and the candidates must prove they are worthy

7day in the sunmeaning:a time when you get attention and are appreciateduse:If she keeps working so hard, she will have her day in the sun and be promoted.

8someone’s days are numbered

meaning:they will not exist for much longeruse:After it got knocked over by that truck, my bike’s days are numbered.

9at the eleventh hourmeaning:at the last moment; almost too lateuse:The director was making changes to the script at the eleventh hour – I mean, the audience were already in the hall!

10 five o’clock shadow

meaning:when a man’s facial hair starts showing a little bit when he hasn’t shaved since morninguse:Andy thinks he has five o’clock shadow, but I’m sure it’s just dirt.

tq but I also want to define character of a person