sib

noun5

1. •
   A kinsman; a blood relation; a relative, near or remote; one closely allied to another; an intimate companion.

   • But she got up to go, and Domenico obeyed me too in mock meekness, making himself sib and coeval to Hortense, submissive to frowning elder brother, something incestuous in it. — 1980
2. •
   A sibling, brother or sister (irrespective of gender)
3. •
   Kindred; kin; kinsmen; a body of persons related by blood in any degree.
4. •
   Any group of animals or plants sharing a corresponding genetic relation
5. •
   A group of individuals unilaterally descended from a single (real or postulated) common ancestor

adjective2

1. •
   Having kinship or relationship; related by same-bloodedness; kindred.

   • […] they are sibber to you than ever Miss Innes was or will be; and if like to bid me, […] — 1871
2. •
   Akin (to); similar (to).

   • […] we are so much the sibber to Christ that we suffer; […] — 1637

verb2

1. •
   To engage in repetitive behaviors such as eye-poking, skin-picking, hand-biting, or head-banging.
2. •
   To bring into relation; establish a relationship between; make friendly; reconcile.

noun2

1. •
   Initialism of self-injurious behavior.
2. •
   Abbreviation of sodium-ion battery.