Quote:
Originally Posted by jierbe31
Hi Emma,
I believe you're mistaken on the verb.
To act up means to behave badly. [quote COBUILD] If someone, especially a child, is acting up, they are behaving badly; an informal expression. EG I'm sorry he had to act up like this.
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Still, wait for some natives' advice.
I wouldn't like to mislead you a second time.

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Hi jierbe,
the verb is it, I've verified. The whole phrase is:
"It was teenage rebellion, and I
acted out for a number of years and slowly but surely straightened myself out, and now I'm make the world a better place". It's said in an ironic mode.
Your help is always appreciated!
Emma