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 उपार
उपारupāraProximity.
[उप-ऋ-कर्मणि घञ्]
Proximity.
A mistake, offence, sin; अस्ति ज्यायान् कनीयस उपारे Rv.7.86.6.