Definition of mires:
(n) :
An undesirable situation; a predicament.
(n) :
Deep mud; moist, spongy earth.
(n) :
A bog or fen; (in wetland science, specifically) a peatland which is actively forming peat, such as an active bog or fen.
(v) :
(transitive) To cause or permit to become stuck in mud; to plunge or fix in mud.
(v) :
(intransitive) To sink into mud.
(v) :
(transitive, figurative) To weigh down.