न वशः

Operational rule vidhi

There is not vocalisation of the semi-vowel of वश्, when the affix यङ् follows.

Word by word (padaccheda)

Indeclinable न avyayaTarget वशः ṣaṣṭhī · ekavacana

Indeclinable An avyaya such as च "and", वा "optionally", न "not".
Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).

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Full reading

न वशः

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

There is not vocalisation of the semi-vowel of वश्, when the affix यङ् follows.
The word यङि is understood here. As वावश्यते, वावश्येते, वावश्यन्ते ॥ Why do we say "when यङ् follows"? Observe उष्टः, उशन्ति ॥ See 6.1.16 to which this rule is an exception.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.