Is it slip of head / slip by tongue?

[Micva]

English Language Tests, Intermediate level

ESL/EFL Test #484 "English Slang Idioms (226)", question 3

"Thanks for waiting for me. I had to give my little brother the .......... He follows me everywhere and he would have ruined our fun if he had come. He tried to follow me but I tricked him," James told his friends.

(a) fake
(b) slip
(c) run
(d) distract

English Language Tests, Intermediate level

ESL/EFL Test #484 "English Slang Idioms (226)", answer 3

"Thanks for waiting for me. I had to give my little brother the slip. He follows me everywhere and he would have ruined our fun if he had come. He tried to follow me but I tricked him," James told his friends.

Correct answer: (b) slip
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is it slip of head /slip by tongue????

Micva

[Kitosdad]

In this instance it means, He avoided meeting him, probably by hiding.
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Keep it simple ... Keep it interesting.

[Alan]

Hi Micva,

Just to add - a slip of the tongue - is an expression meaning either saying something the wrong way round or saying something that you wish you hadn't said.

Alan
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English as a Second Language
You can read my ESL story Present Simple

[Johnpros]

I'm a bit confused. What is the correct form of the idiom? "Slip of the tongue", "Slip by the tongue", "slip by the head" or "slip of the head"? If the four don't have the same meaning, what do the 3 lattest mean?