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In Torah reading, there is a rule of "Nasog Achor". The rule is as follows:

Usually, Hebrew words get the accent (and trope note) on the last syllable. However, if the word following it has its accent on the first syllable then the accent on the previous word moves backwards one syllable.

Example from Shmot 20:20:

From Mechon Mamre's Mikra Im Ta'amim page:

לֹ֥א תַֽעֲשׂ֖וּן אִתִּ֑י אֱלֹ֤הֵי כֶ֨סֶף֙ וֵֽאלֹהֵ֣י זָהָ֔ב לֹ֥א תַֽעֲשׂ֖וּ לָכֶֽם׃

In brief, The 1st אלהי is pronounced "e LO hei" because the next word KHE- sef is accented on the 1st syllable. The 2nd אלהי is pronounced "e lo HEI" because the next word za HAV has its accent on the 2nd syllable.

My question - Is this a rule that emanates from the nature of the Hebrew language dikduk itself, such that Normal Hebrew conversation would require using this rule, or is it only because the rule applies to trope (i.e. - since the trope note is on a certain syllable, that one is accented) and the rule is used only when reading verses in Tana"ch? Would Nasig achor be used during prayers as well?

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It's because it's hard to say a word with the accent on the last syllable followed by a word with the accent on the first syllable. Evidence: This only happens when the trop on the first word is not a pause. – Daniel Jul 11 '14 at 19:00
Try saying EloHEY KHEsef fast – Daniel Jul 11 '14 at 19:07
The title and body don't obviously match. – Isaac Moses Sep 12 '14 at 14:10
According to Koren Publishing's grammarians, as cited in this answer, it's not clear that we apply this rule to prayer that's not Biblical in origin. – Isaac Moses Sep 12 '14 at 14:11
...HaMotzi Lechem Min HaAretz. ykr.org.il/modules/Ask/answer/6182 – Double AA Apr 18 at 2:59

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