if light dawns on you, you suddenly understand something.

He was lying to me, but it was months before the light dawned.

Light dawned on me when I heard she knew my mother. (often + on)

• have ducks in a row
• have ear
• have ear to the ground
• have egg on face
• have egg on your face
• have end away
• have eye on
• have eye on someone
• have eye on something
• have eyes in the back of head
• have eyes in the back of your head
• have eyes like a hawk
• have feet on the ground
• have finger on the button
• have finger on the pulse
• have fingers in the till
• have first call on
• have first call on something
• have first crack at
• have first crack at something
• have first refusal
• have friends in high places
• have fun and games
• have going for
• have going for it