Vocabulary: adj./n. + EN to become verbs

source: Learn English with Rebecca       2015年10月3日
http://www.engvid.com/vocabulary-hack...
http://www.engvid.com/english-resources/
# size:
--shorten / widen / deepen
# color:
--whiten / darken / redden
# quality:
--harden / soften / thicken
# (other):
--sweeten / moisten / loosen / strength / worsen / deepen / ripen / sadden / deaden / weaken / lessen / tighten / quicken / lengthen / flatten / sweeten / broaden / quieten / soften / dampen / sharpen