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 आचाम
आचामācāmaSipping water, rinsing the mouth.
[चम् भावे-घञ्]
Sipping water, rinsing the mouth.
The water or foam of boiled riec (Marâthîपेज); Y.3.322