the.com/sweet deal

A bargain so good you check twice for hidden fees.

means An arrangement or purchase that gives you unusually generous value for what you put in.

from A straightforward pairing rather than a single coined word: 'sweet' has marked things as pleasing or advantageous since Old English (swēte), extending from taste to anything agreeable — a 'sweet spot,' a 'sweet ride.' 'Deal' comes from Old English dǣl, meaning a share or portion, which evolved into the sense of a bargain or transaction by the 19th century. Push them together and you get a phrase that's less etymology than arithmetic: pleasing + transaction = suspiciously good arrangement.

origin
sweet meant pleasing long before it meant sugary
red flag
the better it sounds, the harder you should look
economics
someone always pays for the sweetness
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