Pull your socks up!

Do you know the English expression “to pull your socks up“? Read the conversation below. Can you guess the meaning?

Teacher: You didn’t study for the exam, did you?”

Student: No, I didn’t.

Teacher: Well, if you want to graduate you had better pull your socks up!

Does it mean:

a) wear long socks

b) pull your socks to your knees

c) study for a test

d) make an effort to improve

The answer is below!↓

close up high angle view of camera

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Answer: d) make an effort to improve