I
- I could eat a horse
- I rest my case
- icing on the cake
- if anything
- if it were not for
- if need be
- if not
- if only
- if so
- in a bind
- in a flash
- in a heartbeat
- in a hurry
- in a jiffy
- in a manner of speaking
- in a minute
- in a nutshell
- in a pickle
- in a pinch
- in a row
- in a rut
- in a sense
- in a way
- in a while
- in a word
- in accordance with
- in addition
- in addition to
- in advance
- in and of itself
- in and out
- in any case
- in any event
- in bad taste
- in between
- in brief
- in broad daylight
- in case
- in case of
- in character
- in charge
- in charge of
- in check
- in cold blood
- in common
- in comparison
- in conclusion
- in contrast
- in contrast to
- in control
- in danger
- in debt
- in demand
- in depth
- in detail
- in due course
- in due time
- in effect
- in essence
- in exchange
- in exchange for
- in fact
- in fairness
- in favor
- in favor of
- in favour
- in favour of
- in force
- in front
- in front of
- in full
- in full force
- in future
- in general
- in hand
- in house
- in itself
- in layman's terms
- in lieu of
- in light of
- in line
- in line with
- in living memory
- in love
- in love with
- in memory of
- in mind
- in moderation
- in motion
- in my humble opinion
- in my opinion
- in need
- in no time
- in no way
- in office
- in on
- in one's element
- in one's own right
- in one go
- in order
- in order to
- in other news
- in other words
- in parallel
- in part
- in particular
- in passing
- in person
- in place
- in place of
- in power
- in practice
- in principle
- in private
- in progress
- in public
- in question
- in real life
- in reality
- in regard to
- in relation to
- in respect of
- in retrospect
- in return
- in shape
- in short
- in short supply
- in sight
- in silence
- in spite of
- in stock
- in store
- in summary
- in sync
- in tandem
- in terms of
- in the absence of
- in the act
- in the air
- in the bag
- in the ballpark
- in the black
- in the blink of an eye
- in the clear
- in the closet
- in the dark
- in the doghouse
- in the end
- in the event of
- in the face of
- in the field
- in the first place
- in the flesh
- in the hands of
- in the heat of the moment
- in the know
- in the light of
- in the limelight
- in the long run
- in the long term
- in the loop
- in the meantime
- in the middle of
- in the midst of
- in the moment
- in the mood
- in the name of
- in the near future
- in the nick of time
- in the nude
- in the pocket
- in the presence of
- in the process of
- in the red
- in the same boat
- in the same vein
- in the short run
- in the short term
- in the thick of it
- in the throes of
- in the trenches
- in the vein of
- in the wake of
- in the way
- in the wild
- in the wind
- in the zone
- in theory
- in time
- in total
- in touch
- in truth
- in tune
- in turn
- in use
- in vain
- in view of
- in writing
- in your dreams
- in your face
- ins and outs
- inside job
- inside out
- inside scoop
- instead of
- iron out
- it's about time
- it's all good
- it figures
- it is what it is
- ivory tower