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 न्यस्
न्यस्nyas4 P.
4 Parasmaipada
To set or put down, place, throw down; शिखरिषु पदं न्यस्य Me.13; दृष्टिपूतं न्यसेत् पादम् Ms.6.46.
To lay or throw aside, abandon, give up, resign, relinquish; स न्यस्तचिह्नामपि राजलक्ष्मीम् R.2.7; न्यस्तशस्त्रस्य Ve.3.18; so प्राणान् न्यस्यतिetc.
To put in, place within, place or put down upon anything (with Locative); शिरस्याज्ञा न्यस्ता Amaru.82; चित्रन्यस्त 'committed to picture', V.1.4; स्तनन्यस्तोशीरं Ś.3.8 'applied'; अयोग्ये न मद्विधो न्यस्यति भारतग्ऱ्यम् Bk.1.22; Me.61.
To entrust, consign, commit to the care of, deliver; अहमपि तव सूनौ न्यस्तराज्यः V.5.17; भ्रातरि न्यस्य माम् Bk. 5.82.
To give to, confer or bestow upon; रामे श्रीर्न्य- स्यतामिति R.12.2.
To state, bring forward, adduce, propound (as an argument); अर्थान्तरं न्यस्यति Malli. on Śi.1.17.
mayi sarvāṇi karmāṇi saṁnyasyādhyātmacetasā, — Giving up thy works to Me, with thy consciousness founded in the Self, free from desire and egoism, fight delivered from the fever of thy soul. 3·30
सन्न्यस्यsannyasyaindeclinable past participle or gerund form of the verbal root nyas (to put down, to give up, to resign, to throw or hurl upon) with the prefix sam.