(transitive, obsolete) to give in to.

(transitive, idiomatic) To enter illegally or by force, especially in order to commit a crime. / (transitive, idiomatic) To open or begin to use.

(transitive, idiomatic) Have a controlling influence over.

(colloquial) To become enthusiastically involved in.

(intransitive) To be punished or chastised for doing something prohibited. / (transitive) To cause to be punished. / (intransitive) To fall into difficulty. / (intransitive) To become pregnant.

Used other than figuratively or idiomatically: look into. / (idiomatic) to investigate, explore, or consider

Used other than figuratively or idiomatically: see back, into. / (sports, idiomatic) To advance to the post-season as a result of another team's loss, especially where one's own team has also lost.

Initialism of Irish National Teachers' Organisation.

(euphemistic) To change into clothes that are suitable to be stripped off by a lover.

(idiomatic, colloquial) To have sex with someone, especially for the first time.