Crossword Genius

Avoid early retirement! (3,2)

Ross

I believe the answer is:

sit up

I'm a little stuck... Click here to teach me more about this clue!

'avoid' is the definition.
Although both the answer and definition are verbs in their base form, I cannot understand how they can define each other.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for sit up that I've seen before include "Pay attention - . . . . . and take notice" , "Keep-fit movement" , "Abdominal exercise" , "postpone retirement" , "physical exercise" .)

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