when (someone) was a (mere) twinkle in (their) father's eye

humorous

at a time before someone was born.

All this happened a very long time ago, when you were a mere twinkle in your father's eye.

• up to the mark
• up-to-the-minute
• up to the minute
• up to your neck in
• up to your neck in something
• up to your old tricks
• up your alley
• up your sleeve
• use a sledgehammer to crack a nut
• used to
• used to doing something
• used to do something
• used to something
• Use loaf.
• use something to good account
• use to good account
• use up
• use up something
• Use your loaf.
• usher in
• usher in something
• usher someone in
• vanish into thin air
• vanish off the face of the earth
• Variety is the spice of life.