adj.下垂的；v.向下凹或中间下陷( sag的过去式和过去分词 )；松弛或不整齐地悬着； 英英释义： sag[ sægd ]n.a shape that sags"there was a sag in the chair seat"同义词：droopv.droop, sink, or settle from or as if from pressure or loss of tautness同义词：droopswagflagcause to sag"The children sagged their b