Definition of 締鯖
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(n) mackerel (esp. the chub mackerel, Scomber japonicus)
早く帰った方がいい、暑いから。サバは、生き腐れとも言われるくらい足が早い。
It's hot, so you'd better head back quickly. Mackerel goes off so fast that they coined 'fresh-looking rotten fish'.