slip of the pen
The mistake of writing something different from what you should or what you planned.
That was a slip of the pen. I meant to write September, not November.
I wish you would forget it. That was a slip of the pen.
slip of the tongue
slip of the lip
The mistake of saying something you had not wanted or planned to say; an error of speech.
No one would have known our plans if Kay hadn't made a slip of the tongue.
She didn't mean to tell our secret; it was a slip of the lip.
slip off
To slide off something.
The children climbed up the hill but when it was time to come down, they didn't walk, but slipped off the smooth, old ledges.
slip one's mind
To forget something.
Забыть что-либо.
I meant to mail those letters but it entirely slipped my mind.
Oh dear! It had slipped my mind that the banks were closed today.
Боже мой! У меня из головы вылетело, что банки сегодня не работают.
slip through one's fingers
To escape without someone's knowing how.
Policemen surrounded the building, but the thief managed to slip through their fingers.
Mike earns a good wage, but he doesn't save a penny. Money just slips through his fingers.
slip up
goof up
To make a mistake.
Someone at the bank slipped up. There are only 48 pennies in this 50c roll of coins.
If he hadn't slipped up on the last questions, his score on the test would have been perfect.
I really goofed up on the exam today; did you mess up, too?
Karen slipped up when she forgot to deposit money into her checking account.
slipup
A mistake.
"I'm sorry, sir. That was an unfortunate slipup," the barber said when he scratched the client's face.