Well, dictionaries give either "tuck into something" or "tuck in" (intransitive), in this meaning.If it were me, it would read "He was tucking in to a huge plateful ...", and "They tucked in to a hearty breakfast...".
For me, the phrasal verb is "tuck in" rather than "tuck into", though I expect there are lots of "tuck into" fans in this context.
So, was I correct then in #5? I mean:The definitions are for "tuck in", with "tuck into" given as an alternative. They seem to have forgotten that "Tuck in" can be used intransitively, whereas "tuck into" cannot.
So then we have: "tuck in" means that food goes into you. "Tuck into" means that you "go" into food. Is that what it means?...
I don't understand what you mean by that pale color, sorry.(They ate the food)
You are right, velisarius.So would you also "Go in to a room" Rain? When I say "He tucked into the food" I find impossible to make even the slightest pause between "in" and "to". If the phrasal verb in that sentence were "tuck in" I think it should be p[ossible to pause slightly between the two prepositions, as with "He went in to great applause."