I've read an unusual number of books lately by Brits or Anglophiles, and something that's really sticking in my etymological craw is the turn of phrase involving "tucking into" a plate of food. Now, where I'm from, "tuck in" and "tuck" have connotations that have nothing to do with mealtime.

1. Tucking in your shirt.
2. Being tucked into bed.
3. Nip & tuck (i.e. cosmetic surgery)
4. The sewing-specific sense, taking a tuck in a waistband, for instance - a shorthand for altering something to a smaller size (I could go into far deeper detail on this one, but I won't bother.)

In thinking about this, I became further confused when my Joyceian brain took over and led me down the paths of:

5. Friar Tuck (of Robin Hood fame)
6. The surname "Tucker"
7. Tuckered out = tired

Anyone have any enlightening thoughts? Logic (spurious or otherwise) to explain a connection among these? Some of the connections I find obvious (3 & 4 dovetail very nicely in my mind), but particularly "tucking into" a plate of food is a mystery to me...