Usage Note
Rallonger means to make something longer — a skirt, a table, a deadline. The noun rallonge refers to an extension (a table leaf, an extension cord, or extra time informally). Note the spelling with double-l; the base verb allonger is also common and nearly synonymous, but rallonger implies adding length to something that already existed.
Examples
"Il faut rallonger la table pour les invités."
Natural Translation
We need to extend the table for the guests.

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