Having kinship or relationship; related by same-bloodedness; having affinity; being akin; kindred.

Kindred; kin; kinsmen; a body of persons related by blood in any degree. / A kinsman; a blood relation; a relative, near or remote; one closely allied to another; an intimate companion.

(transitive) To bring into relation; establish a relationship between; make friendly; reconcile.

(intransitive, clinical psychology) To engage in repetitive behaviors such as eye-poking, skin-picking, hand-biting, or head-banging.

simple past tense and past participle of sib

present participle of sib

(UK, military) Initialism of Special Investigation Branch. / (clinical psychology) Initialism of self-injurious behavior.

plural of sib

(rare) Kinship.

A sibling's younger sibling (used especially by children or by parents in speaking to their children).