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slang A shortening of the word "naturally," meaning "of course." The spelling approximates the sound of the first syllable of "naturally." Primarily heard in US. A: "And did you adjust for inflation?" B: "Natch! The numbers all check out, man." A: "Is it all right if I borrow your computer for a while?" B: "Natch, dude. No problem."
on the natch
slang No longer using or addicted to drugs or alcohol; in a clean, natural state. ("Natch" is a slang shortening of "natural.") My wife and parents helped me get through rehab five years ago, and I've been on the natch ever since.
interj. yes; naturally. Natch, you can borrow my car.
on the natch(...nætʃ)
mod. free of drugs; natural and straight. I have been on the natch for almost a year.