Rig Veda 1.145.4

Sanskrit text [Accents, Plain, Transliterated]:

उ॒प॒स्थायं॑ चरति॒ यत्स॒मार॑त स॒द्यो जा॒तस्त॑त्सार॒ युज्ये॑भिः । अ॒भि श्वा॒न्तं मृ॑शते ना॒न्द्ये॑ मु॒दे यदीं॒ गच्छ॑न्त्युश॒तीर॑पिष्ठि॒तम् ॥
उपस्थायं चरति यत्समारत सद्यो जातस्तत्सार युज्येभिः । अभि श्वान्तं मृशते नान्द्ये मुदे यदीं गच्छन्त्युशतीरपिष्ठितम् ॥
upasthāyaṃ carati yat samārata sadyo jātas tatsāra yujyebhiḥ | abhi śvāntam mṛśate nāndye mude yad īṃ gacchanty uśatīr apiṣṭhitam ||

English translation:

“When (the priest) proceeds to effect his development, he is (at once) manifested; and as soon as engendered, is associated with his objects; he provides for the gratification (of his worshipper), plural cidly engaged in the agreeable (rite), when the (oblations) that desire (his acceptance) reach him present (at the sacrifice).”

Commentary by Sāyaṇa: Ṛgveda-bhāṣya

Is associated with his objects: tatsāra yujyebhiḥ;

Tsara = to go;

Yujya = that which may be joined with;

Explanations: as being joined with abilities, that may be associated with their objects, or with energies (tejobhiḥ) fit to be connected with their consequences, or with his horses joined to his car

Details:

Ṛṣi (sage/seer): dīrghatamā aucathyaḥ [dīrghatamas aucathya];
Devatā (deity/subject-matter): agniḥ ;
Chandas (meter): bhuriktriṣṭup ;
Svara (tone/note): Swar;

Padapatha [Accents, Plain, Transliterated]:

उ॒प॒ऽस्थाय॑म् । च॒र॒ति॒ । यत् । स॒म्ऽआर॑त । स॒द्यः । जा॒तः । त॒त्सा॒र॒ । युज्ये॑भिः । अ॒भि । श्वा॒न्तम् । मृ॒श॒ते॒ । ना॒न्द्ये॑ । मु॒दे । यत् । ई॒म् । गच्छ॑न्ति । उ॒श॒तीः । अ॒पि॒ऽस्थि॒तम् ॥
उपस्थायम् । चरति । यत् । सम्आरत । सद्यः । जातः । तत्सार । युज्येभिः । अभि । श्वान्तम् । मृशते । नान्द्ये । मुदे । यत् । ईम् । गच्छन्ति । उशतीः । अपिस्थितम् ॥
upa-sthāyam | carati | yat | sam-ārata | sadyaḥ | jātaḥ | tatsāra | yujyebhiḥ | abh i | śvāntam | mṛśate | nāndye | mude | yat | īm | gacchanti | uśatīḥ | api-sthitam

Multi-layer Annotation of the Ṛgveda

[Rigveda 1.145.4 English analysis of grammar]