meirg, f. (gs. ~e).1. Rust. Iarann ag tógáil ~e, iron rusting. Tháinig ~ air, it rusted. Chuir an taisleach ~ air, the damp rusted it. Tá ~ ar a chuid Gaeilge, his Irish is rusty. An mheirg a bhaint de rud, to rub the rust off sth.; to brush up sth. Seanscéal is ~ air, a hoary old tale. 2. Crustiness, irritability. Tháinig ~ air chugam, he became annoyed with me. Gan mheirg gan mhírún, without rancour or ill-will.