tough call

US idiomatic

(chiefly US, idiomatic) A choice or judgment which is difficult to make, especially one involving only two alternatives.

Japanese Meaning

難しい決断、特に二者択一の場合にどちらを選ぶのか判断しにくい状況を指す / どちらにするか迷う困難な選択 / 判断が難しい状況や厳しい選択

Choosing between promoting Sarah and keeping the more experienced Mark was a tough call for the manager.

サラを昇進させるか、より経験豊富なマークを残すかを選ぶのは、マネージャーにとって難しい判断でした。

Sense（1）

(chiefly US, idiomatic) A choice or judgment which is difficult to make, especially one involving only two alternatives.

Will it work? It's a tough call.

tough calls

（ plural ）