back to back jack

Noun

(baseball) Two home runs hit by consecutive batters

Japanese Meaning

（野球用語）連続する打者が打った2本のホームラン

The crowd erupted after the two rookies hit a back to back jack in the seventh inning.

七回に新人二人が連続本塁打を放ち、観衆は沸き立った。

Sense（1）

(baseball) Two home runs hit by consecutive batters

Smith, Jones... back to back jacks in the sixth chasing the starter.

back to back jacks

（ plural ）