एष उ वा उद्गीथः प्राणो वा उत्प्राणेनहीदँ सर्वमुत्तब्धं वागेव गीथोच्च गीथाचेति स उद्गीथः ॥ २३ ॥
In plain words
This verily is the udgītha. Prāṇa is 'ut', for by prāṇa all this universe is upheld; and speech is indeed 'gīthā'. 'Ut' is prāṇa, and gīthā is speech; together, they form the udgītha.
Close to the Sanskrit
This indeed is the udgītha, prāṇa is ut; for by prāṇa all this universe is supported upwards, speech alone is gīthā, 'ut' is prāṇa, and gīthā is speech, and that is the udgītha.