Question 1

What does "strengthen up" mean?

Accepted Answer

To develop greater physical strength, especially through exercise and training.

Question 2

How do you use "strengthen up" in a sentence?

Accepted Answer

You need to strengthen up your core muscles to prevent back injuries.

Question 3

Is "strengthen up" formal or informal?

Accepted Answer

"strengthen up" is informal — used mainly in casual conversation. Less common than 'strengthen' alone. The 'up' adds a sense of improvement to full capacity. More common in fitness and coaching contexts. Slightly informal.

strengthen up

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