Definition of sweeten
1
: to make sweet
2
: to soften the mood or attitude of
3
: to make less painful or trying
4
: to free from a harmful or undesirable quality or substance
especially
: to remove sulfur compounds from
sweeten natural gas
5
: to make more valuable or attractive
sweeten the deal
: such as
a
: to increase (a pot not won on the previous deal) by anteing prior to another deal
b
: to place additional securities as collateral for (a loan)
: to become sweet
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Merriam-Webster unabridged
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Time Traveler for sweeten
The first known use of sweeten was circa 1552
See more words from the same year