• to give sy the cut direct
• to recognize sy as one's son
• to claim acquaintance with sy
• have a good grip of a subject
• have a good grip of a subject
• have a good grip of a subject
• be acquainted with, do you know
• to be in the swim, to know the ropes, to know what's what
• to know sg through and through
• I know my Homer from beginning to the end