Akademik

so long
noun
a farewell remark
-

they said their good-byes

Syn:
adieu, ↑adios, ↑arrivederci, ↑auf wiedersehen, ↑au revoir, ↑bye, ↑bye-bye, ↑cheerio, ↑good-by, ↑goodby, ↑good-bye, ↑goodbye, ↑good day, ↑sayonara
Hypernyms: ↑farewell, ↑word of farewell

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\\ ̷ ̷ˈ ̷ ̷\ interjection
: good-bye

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Informal.
good-bye: I said so long and left.
[1840-50, Amer.]

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so long (informal)
Goodbye (poss from Ar salaam peace, used as a word of farewell)
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Main Entry:long

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so long informal phrase
used for saying goodbye to someone who you know well
Thesaurus: ways of saying goodbyesynonym
Main entry: so

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so long,
Informal. good-by; farewell.

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so long
informal :goodbye, 1

So long (for now)! Have a safe journey home!

She said so long to her friends and family and headed off to college.

— sometimes used figuratively

the time of year when we say so long to winter coats [=when we stop wearing winter coats]

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Main Entry:long
————————
so long — see long, 2
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Main Entry:so

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so ˈlong idiom
(informal) goodbye
Main entry:longidiom

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so long
see long adv. 1 c.

Useful english dictionary. 2012.