sib

adj

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, […]”

   “seeing that his Majesty is "sibber to him than all the brothers and sons he has in the world." So far, James Haig had played his part with consummate skill.”

   “"You talk about the crook in our Campbell tongue in one breath," said he, "and in the next you would make yourself a Campbell more sib to the chief than I am myself. Don't you think we might put off our little affairs of family history till we find a lady and a child in Strongara?"”

2. Akin (to); similar (to).

   “[…] we are so much the sibber to Christ that we suffer; […]”

   “1701. June 19. Dewar of Lassody against Scott of Spencerfield's Factor and Creditors. […]; and that creditors seemed to be much sibber to these annualrents than the factors.”

   “I like my cousins in Holland immensely, but I feel more sib to the Northerners. Your description of Lofoten is fine. I can see them. They must be enchanting in their way, cod's head and tails or no. There is a fine eau de Javelle smack about a Dutch canal, by the way, that takes[…]”

noun

1. Kindred; kin; kinsmen; a body of persons related by blood in any degree.
2. 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.”

3. A sibling, brother or sister (irrespective of gender)
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
6. (abbreviation, alt-of, countable, initialism, uncountable)Initialism of self-injurious behavior.

   “A treatment consisting of differential reinforcement of compliance and a quiet-hands procedure (repeatedly guiding her to place her hands in her lap for 30 s) contingent on SIB was shown to be effective in reducing Candy’s SIB to low levels during vocational training sessions.”

7. (abbreviation, alt-of, countable, uncountable)Abbreviation of sodium-ion battery.

verb

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

name

1. (UK, abbreviation, alt-of, initialism)Initialism of Special Investigation Branch.