though
adv. sent.adv. used to add a fact or opinion that makes your previous statement less strong. It usually comes at the end of a sentence and means something similar to 'however'.
adv. used to introduce a contrast or concession to a previous statement. In this adverbial sense, it functions as a sentence connector and is typically placed at the end of a clause.
The food was expensive. It was delicious, though.
The hike was much longer than we expected; we reached the summit before sunset, though.
The initial results of the clinical trial were somewhat inconclusive; the researchers remained optimistic about the long-term efficacy of the treatment, though.
From Middle English though, thogh, from Old Norse þóh (later þó). Superseded (in most dialects) Middle English thegh, from Old English þēah (“though, although, even if, that, however, nevertheless, yet, still; whether”). Both the Old Norse and Old English are from Proto-Germanic þauh (“though”), from Proto-Indo-European to-, suffixed with Proto-Germanic -hw < Proto-Indo-European *-kʷe (“and”). Akin to Scots tho (“though”), Saterland Frisian dach (“though”), West Frisian dôch, dochs (“though”), Dutch doch (“though”), German doch (“though”), Danish dog (“though, however”), Swedish dock (“however, still”), Icelandic þó (“though”). More at that.
When used as an adverb, it almost always appears at the end of the sentence or clause. It is separated from the rest of the sentence by a comma in formal writing.
Though it was raining, but we went out.Though it was raining, we went out.Learners often use 'though' and 'but' in the same sentence, but only one conjunction is needed to show contrast.