Meaning: to start a conversation in a social setting. To start something. To set something in motion which is then difficult to be stopped.

Example Sentences:
1.- The ball was rolling when he struck that first conversation with her, she could not refuse his proposal knowing how charming he really was!
2.- The cabinet’s proposal on women’s safety was shot down earlier by the houses of the parliaments but the ball is rolling again after this really unfortunate incident.

Meaning: a vulnerable spot or weakness. A small fault in a person or system that can result in its failure.

Example Sentences:
1.- The corrupt minister is regarded as the government’s Achilles heel and is expected to resign.
2.- Though he was a good person, his short temper was his Achilles heel.

Meaning: by one’s own choice. Voluntarily, willingly, without coercion.

Example Sentences:
1.- The managing director of the company didn’t have to be asked to resign – he went of his own accord.
2.- Do you think the officer gave that statement of his own accord or was he forced to do it by his superiors?