What's the verb for "to drink small amounts of drink" (especially to enjoy it as slowly and long as possibly)? What's the drinking equivalent of "nibble"?
sip is the common word, but it does not denote 'to enjoy it as slowly and long as possibly'. For that, I suggest savor (UK: savour)
Taste (good food or drink) and enjoy it to the full
He has dinner and actually savors the wine, rather than drinking to get drunk.
Enjoy or appreciate (something pleasant) to the full, especially by lingering over it
Drink (something) by taking small mouthfuls.
‘I sat sipping coffee’ ‘she sipped at her tea’
You can definitely savor a good cup of coffee. A difference is this: if your coffee is hot, you can use she sipped her coffee because it was hot but you wouldn't really say she savored her coffee because it was hot. You'd say she savored her coffee because it was delicious.
sip is also a occurs as a noun, meaning
A small mouthful of liquid (Oxford)
And we say stuff like take a sip (very common) and have a sip. She took a sip of wine is equal to she sipped her wine (one time).
Thesaurus.com lists these synonyms for sip (verb):
drink in, extract, imbibe, partake, quaff, sample, savor, sup, swallow, taste, toss
Only savor includes the notion of enjoy as part of its definition. Quaff means to 'drink (alcoholic beverages) heartily' but does not include the sense of slow enjoyment. In fact, it can be more of an antonym, since 'drink heartedly' can entail drinking quickly.
Another verb would be nurse. From Dictionary.com, usage #11 as a verb:
to use, consume, or dispense very slowly or carefully: He nursed the one drink all evening.
To sip conveys the idea:
- to drink, taking only a very small amount at a time:
- This tea is very hot, so sip it carefully. She slowly sipped (at) her wine.
To Sup "take (drink or liquid food) by sips or spoonfuls."
Other than the words sip and sup, you may want something else. I was thinking you could use a regular drinking word that could be used as what you are asking for and just the definition of "drink". Here are some examples:
He drank his beverage drop by drop until it was drained.
She took a hint of her coffee.
They had a small portion of their precious water.
Hopefully these words don't go too far.