(Northern English) Sulky, moody.
Early 20th century: from dialect mard ‘spoilt’ (describing a child), alteration of marred (see mar).
“If you’re going to be mardy about it I won’t take you!”
A conference or meeting to discuss a particular subject./ A collection of essays or papers on a particular subject by a number of contributors.
Late 16th century (denoting a drinking party): via Latin from Greek sumposion, from sumpotēs ‘fellow drinker’, from sun- ‘together’ + potēs ‘drinker’.