UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈswiːtən/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈswitən/ ,USA pronunciation: respelling(swētn)

WordReference Random House Learner's Dictionary of American English © 2020
sweet•en /ˈswitən/USA pronunciation   v. 
  1. to (cause to) become sweet: [+ object]Add some brown sugar to sweeten the mix.[no object]As the wine ages it will gradually sweeten.
  2. [+ object] to make (the breath, air, etc.) sweet or fresh, as with a commercial product.
  3. [+ object] to remove sulfur and its compounds from (oil or gas).
  4. Informal Termsto add to the value or attractiveness of (a business deal, proposal, etc.):[+ object]The company sweetened its salary offer to her.
sweet•en•er, n. [countable]

WordReference Random House Unabridged Dictionary of American English © 2020
sweet•en  (swētn),USA pronunciation v.t. 
  1. to make sweet, as by adding sugar.
  2. to make mild or kind;
  3. to lessen the acridity or pungency of (a food) by prolonged cooking.
  4. to reduce the saltiness of (a food or dish) by diluting with water, milk, or other liquid.
  5. to make (the breath, room air, etc.) sweet or fresh, as with a mouthwash, spray, etc.
  6. Music(in musical recording) to add musical instruments to (an arrangement), esp. strings for a lusher sound.
  7. Chemistry
    • to make (the stomach, soil, etc.) less acidic, as by means of certain preparations, chemicals, etc.
    • to remove sulfur and its compounds from (oil or gas).
  8. Informal Terms
    • to enhance the value of (loan collateral) by including additional or especially valuable securities.
    • to add to the value or attractiveness of (any proposition, holding, etc.).
  9. Wineto add more liquor to (an alcoholic drink).
  10. Games[Poker.]to add stakes to (a pot) before opening.

  1. to become sweet or sweeter.
  • sweet + -en1 1545–55

Collins Concise English Dictionary © HarperCollins Publishers::
sweeten /ˈswiːtən/ vb (mainly tr)
  1. (also intr) to make or become sweet or sweeter
  2. to mollify or soften (a person)
  3. to make more agreeable
  4. (also intr) to free or be freed from unpleasant odours, acidic or corrosive substances, or the like
'sweeten' also found in these entries (note: many are not synonyms or translations):
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