batten

...(E)=improve in condition, archaic xvi,=grow fat/thrive, xvii(Sh., Jonson), in earlier dial. use, b/p/fatten(E)= batna(ON)=improve,=gebatian(OE)=get better(E)= bat(OHG),=b/patla(Nauatl)=alternate,=paddle/battle(E)= uapatla(N)=swap(E).