I

[into one's blood]

See: [IN ONE'S BLOOD].

[into one's head]

See: [BEAT INTO ONE'S HEAD], [TAKE INTO ONE'S HEAD].

[into one's own]

See: [COME INTO ONE'S OWN].

[into one's own hands]

See: [TAKE THE LAW INTO ONE'S OWN HANDS].

[into one's shell]

See: [IN ONE'S SHELL].

[into one's shoes]

See: [STEP INTO ONE'S SHOES].

[into practice]

See: [IN PRACTICE].

[into question]  {adv. phr.}

Into doubt or argument. — Usually used with "call", "bring" or "come".

This soldier's courage has never been called into question.

[into the bargain]

See: [IN THE BARGAIN].

[into the fire]

See: [OUT OF THE FRYING PAN INTO THE FIRE].