Irrational fear of the number 4. This is most prominent in East Asian countries.

Noun: a friend who is usually only called upon by a friend when a more primary/prominent friend is unavailable.

Taken from the term “second string” in an athletic competition situation. In football, if the star quarterback gets injured during a play, the second string is called off the bench to replace him/her. A “Second String Friend” is essentially benched until needed, if ever.

Synonyms: Plan B, Second Choice, Secondary Friend, Benched Until Needed

the fear of the number 4
tetraphobia is serious and you ignore everything that includes the number 4. you do not say 4 letter words, write them in essays or notes, eat 4 skittles at a time, have 4 buttons on your shirt, play a fourth on the piano, etc...

(1) Fear of being kidnapped by a -princess- pirate girl.
(2) Fear of there being a fourth piece of the Triforce.