Best Pali to English translation source I’m very new to Buddhism and am wanting to find an accurate source to show me the word-for-word interpretations of terms and words. Right now I’m trying to learn the meaning of each word of the “Ethan santhan ethan paneethan..” chant and although I have the English explanation of the whole thing, I want to know what each word translates to in order to gain the best personal understanding of how this mantra is said and also how Pali works.
I’d appreciate any help on this. Thank you.
Here is a slightly modified B.Thanissaro translation of that passage (etam santam...), with pali + english lined up side by side, nearly word for word order.
http://lucid24.org/an/an09/an09-0036/toc-addon/index.html

suttacentral.net is an excellent resource, if you configure the settings on there to show pali with english for B.Sujato translations (aside from KN, he has complete set of translations for nikayas). You can view them side by side or line by line.

lucid24.org has a snapshot of B.Sujato's translations as of 2019-jan., arranged in side by side pali+english, with an important correction to B. Sujato's mistranslation of the 4 jhana formula. 

DPR (digital pali reader) is an offline excellent resource addon for firefox.

Those resources will save you an enormous amount of time from the tedious and frustrating old tech research methods. But with that said, don't expect to get an understanding of the Dhamma even if you read the entire Pali and English collection with a decent intellectual understanding. It's only through repeated reflection over years, and seeing how the various important terms are used in various contexts throughout the canon, and a deepening of samadhi in your meditation practice that the passages will really make sense, and you're able to sort out for yourself the various controversies and sharply divergent interpretations existing out there.