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First thing

adv, noun

Adverb

1
Early in the morning. not-comparable
"I'll meet you first thing at the station."
2
Straight away, very soon. not-comparable
"Some of 'em said that when a boy had been away from home a couple of years he ought to want to see his folks the first thing."

Noun

1
The basic idea of how to do something.
"I would help you, but I don't know the first thing about gardening."
2
Used other than figuratively or idiomatically: see first, thing.
"I stumbled along through the young pines and huckleberry bushes. Pretty soon I struck into a sort of path that, I cal'lated, might lead to the road I was hunting for. It twisted and turned, and, the first thing I knew, made a sudden bend around a bunch of bayberry scrub and opened out into a big clear space like a lawn."

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