Verse meaning
This is the verse translation, not a definition of the individual word.
If you do not support the Prophet, Allah has already supported him when the disbelievers forced him out; when he was second of the two[1] in the cave – saying to his companion, “Do not grieve; Allah is with us.” Thereupon Allah sent down His tranquility upon him, supported him with soldiers that you did not see[2], and rendered the word of the disbelievers[3] the lowest, whereas the Word of Allah[4] is supreme. And Allah is All-Mighty, All-Wise.
Source
[1] The second was his companion, Abu Bakr. [2] Angels came to the Prophet’s aid in the small cave. [3] i.e., their claims and slogans of disbelief. [4] i.e., "La ilaha illa Allah" (There is no true deity except Allah).
Source: QuranEnc.com · English Translation - Rowwad Translation Center
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