A word denoting a part of the body which is constant (and indispensable) with the exception of parśu has after a preposition in a bahuvrīhi samāsa the acute accent (udātta) on the last syllable.,
Thus प्रपृष्ठः꣡, प्रोदरः꣡, प्रललाटः꣡; सततं यस्य प्रगतं पृष्ठं भवति स प्रपृष्ठः ॥ Why do we say 'after a Preposition'? Observe दर्शनीयललाटः ॥ Why do we say 'part of the body'? Observe प्रशाखो वृक्षः ॥ Why do we say 'dhruva-constant and indispensable'? Observe उद्बाहुः क्रोशति ॥ Here the hand is raised up only at the time of cursing and not always, so the state of उद्बाहु is temporary and not permanent. Why do we say with the exception of पर्शु? Observe उ꣡त्पर्शुः, विप꣡र्शुः 6.2.1.,