Wiktionary
mend fences
vb. (context idiomatic English) To repair damage to a friendship or relationship after a disagreement or other mishap.
Usage examples of "mend fences".
Then she's going to fly to San Diego to mend fences with those Mexican people who run up the centerline of highways.
She distrusts Blue Block, supports Parliament, and is very keen to mend fences with old enemies.
She'd come here only to seduce him, to mend fences, to revive memories.
He must mend fences there, explain away the actions of his wife and brother, and patch up an understanding.