shrug /ʃrəɡ/
verb (shrugs, shrugging, shrugged) [with object]
raise (one's shoulders) slightly and momentarily to express doubt, ignorance, or indifference:
Jimmy looked inquiringly at Pete, who shrugged his shoulders | [no object] : he just shrugged and didn't look interested.

shrug something off - dismiss something as unimportant, disregard, take no notice of, ignore, pay no heed to, play down, make light of.: the managing director shrugged off the criticism. / he just shrugged off all of my advice.

noun
1 an act or instance of shrugging one's shoulders:
she gave him a dismissive shrug.
2 a woman's close-fitting cardigan or jacket, cut short at the front and back so that only the arms and shoulders are covered.

ORIGIN
late Middle English (in the sense ‘fidget’): of unknown origin.

sibling
/ˈsɪblɪŋ/
noun
each of two or more children or offspring having one or both parents in common; a brother or sister.
ORIGIN
Old English, in the sense ‘relative’(see
sib, -ling). The current sense dates from the early 20th century.

THESAURUS
sibling /ˈsɪblɪŋ/
noun
he hasn't seen his siblings in eight years: SISTER, BROTHER; sib.