in league with
in lieu of
in light of
in loco parentis
in love
in memoriam
in memory of
in miniature
in moderation
in motion
in mourning
in mufti
in my opinion
in my view
in name only
in need
in no mood
in no time
in no way
in number
in one word
in one's birthday suit
in one's element
in one's heart
in one's own right