(sports, chiefly racing) The lane or track nearest to the interior. / (figuratively) Any advantage.

(rugby) A player who is positioned between the fly-half and the outside centre

(US, idiomatic, baseball) Technical matters concerning baseball generally not apparent or of interest to spectators. / (US, idiomatic, by extension) Matters of interest only to insiders.

(idiomatic) A crime or other illicit action committed by or with the help of someone either employed by the victim or entrusted with access to the victim's affairs and premises.

(rugby) a back whose primary job is to create space for the outside backs outside him, i.e. the scrum-half, the fly-half and the inside centre.

Synonym of insider trading

(finance) The illegal buying or selling of securities of a publicly held company by a person who has privileged access to information concerning the company's financial condition or plans.

Alternative form of inner diameter

plural of inside joke

(baseball, informal) A home run in which the ball does not leave the field of play; an inside-the-park home run.