V. S. Apte, The Practical Sanskrit–English Dictionary. Look up any word of the Gita in Devanagari, IAST or Harvard-Kyoto, or browse the headwords letter by letter.
Entry उपवीतम्
उपवीतम्upavītamInvestiture with the sacred thread.
[उप-वे-क्त]
Investiture with the sacred thread.
The sacred thread worn by the first three classes of the Hindus; पित्र्यमंशमुपवीतलक्षणं मातृकं च धनु- रूर्जितं दधत् R.11.64; मुक्तायज्ञोपवीतानि Ku.6.6; Śi.1.7; Ki.12.23; Ms.2.44,64,4.36,66.