sore point

noun

(idiomatic) An action, belief, or state of affairs which is an enduring basis for disagreement or dissatisfaction.

His constant lateness is a sore point in their relationship.

意味（1）

(idiomatic) An action, belief, or state of affairs which is an enduring basis for disagreement or dissatisfaction.

The affair of the chaplaincy remained a sore point in his memory as a case in which this petty medium of Middlemarch had been too strong for him.