To back again; to return to support or endorse something previously backed.
From the prefix 'be-' (used to form verbs with intensive or causative meaning) plus 'back.' The 'be-' prefix has Old English origins and creates verbs that give a particular quality to the root word.
The 'be-' prefix is a hidden workhorse in English—it turns nouns into verbs and adds subtle meanings, so 'beback' means to back something once more, following the same logic as 'befriend' (to make a friend of) or 'belittle.'
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