Gat" is an argument we get into every time. I uphold that it is most certainly a word, though archaic in form. But the dictionary we looked it up in *didn't have it*. I still think it's a word, but I usually just let them cross it off anyway.
My dictionary has it.
Gat vb. Arch. a past tense of get.
Merriam-Webster Online has it, too:
LabRat
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