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vaca:: um वच‌ उम् ONPANINI 74020

Replace vac वच् with voc वोच् (before /aG).

vacer aGgasyAGi parata:: um-Agamo bhavati | वचेरङ्गस्याङि परत‌ उमागमो भवति ।

vac वच् + doershowing /luG /tip
→ avac अवच् + /tip by luGlaGlRGkSvaD...
→ avac अवच् + /t'''
→ avac अवच् + /aG + /t''' by asyativakt...
→ avoc अवोच् + /aG + /t'''u उ by this rule
→ !**avocat अवोचत् "he said"

Similarly —

vac वच् + /luG /tas
→ avoca- अवोचॱ /tAm'''
→ !**avocatAm अवोचताम्

vac वच् + /luG /jhi
→ avoca- अवोचॱ /ant'''
→ !**avocan अवोचन्

Why do we say flat?

/sic stays before bent.

Why doesn't **avocan अवोचन् get /jus?

The /luG gets /jus by sijabhyastav..., but only when it ACTUALLY has /sic.

But, shouldn't sthAnivadAd... apply here?

Not at all. That sthAniva स्थानिव would allows /sic to inherit from /cli, but here you are trying to make /cli inherit from /sic.

Coulson in chapter 15 tells us that this avoc अवोच् is a "reduplicated form", by which he likely means that it likely evolved from an earlier avavacat.

What's the um उम् in the sUtra?

It is an "u उ" mitaugment.

Why didn't /pANini just say vacovoc?

To make the sUtra ASHAP.