Does 'get it going' mean the same as 'light it up'? Is there any other expression which will mean 'light it up'?
Yes, "get it going" in this context means the same thing as "light it up" and refers to lighting up the fire. You can also say "start it up" to have the same meaning as "light it up". Ex: Can you start up the fire? It's getting cold in here. Ex: She will light up the fire so we can roast marshmallows.
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