Third-person singular simple present indicative form of fatten.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "fattens" in a sentence
"The effect "fattens" the guitar's amplified tone and provides the guitarist with an overall "bigger sound" with dramatic detail to each and every note."
"Iron Man 2 "fattens" up the cash cow for the slaughter ('scuse the cynicism, see"
"He fattens hatchlings in large enclosed tanks that look like mud huts, heating the water to 90 degrees to speed up their metabolism."