6.2.167
मुखं स्वाङ्गम्
Operational rule vidhi
In a बहुव्रीहि समास the acute accent (उदात्त) is on the final when the second member is मुख 'mouth' i.e. the actual bodily part of an animal and not used metaphorically.
Word by word (padaccheda)
Substitute / term मुखम् prathamā · ekavacanaSubstitute / term स्वाङ्गम् prathamā · ekavacana
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Full reading
मुखम् स्वाङ्गम्
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
In a बहुव्रीहि समास the acute accent (उदात्त) is on the final when the second member is मुख 'mouth' i.e. the actual bodily part of an animal and not used metaphorically.
Thus गौरमुखः꣡, भद्रमुखः꣡ ॥ Why do we say 'an actual part of a body'? Observe दीर्घमुखा शाला ॥ Here मुख means "entrance or door". The word स्वाङ्ग means "a non liquid substance actually to be found in living beings &c". as explained in 3.4.54.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.