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killing two birds with one stone
運動を兼ねた買い物は、一石二鳥だ。
Shopping combined with exercise is killing two birds with one stone.
この新制度は、経費削減と社員の士気向上で一石二鳥となった。
This new system became a case of killing two birds with one stone by reducing costs and boosting employee morale.
自転車通勤は、交通費節約と健康増進で一石二鳥になる。
Commuting by bicycle kills two birds with one stone, saving on transportation costs and improving health.