Gets into a bad state (4)

I believe the answer is:

rots

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'gets' is the definition.
The definition and answer can be both related to bodily activities as well as being verbs in their -s form.
Maybe they are linked in a way I don't understand?

'a bad state' is the wordplay.
'a bad' becomes 'rot' (I've seen this before).
'state' becomes 's' (this could be a standard abbreviation I've not previously seen).
'rot'+'s'='ROTS'

'into' is the link.

Can you help me to learn more?

(Other definitions for rots that I've seen before include "Decomposes" , "Decays" .)

I've seen this clue in the Evening Standard.

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