A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
- O vs. Oh – Usage, Meaning & Examples
- Oar, ore and or
- Oases
- Object lesson
- Object vs object
- Objects in Grammar – How to Identify (With Examples)
- Obliged vs. obligated
- Oblique
- Obsequious
- Observance vs. observation
- Obsolescent vs. obsolete
- Obstreperous
- Ocher or ochre vs okra
- Ocher vs. ochre
- Octopuses vs. Octopi – What Is the Plural of Octopus?
- Odious vs odorous
- Odor or Odour – Meaning, Difference & Spelling
- Oeuvre – Usage and Meaning in English
- Off Of – Usage & Meaning
- Off the cuff
- Off the grid or off-grid
- Off the Hook—More Than Just an Escape
- Off the Rack (Peg)—A Simple Phrase for ‘Ready-to-Wear’
- Off the record vs not for attribution
- Off The Wagon and On The Wagon – Meaning & Examples
- Off the Wall – Idiom, Meaning and Origin
- Off Your Rocker—Idioms of Eccentricity
- Off-kilter and out of kilter
- Offal vs. Awful
- Offence vs. offense
- Offhand
- Oftentimes
- Oh vs. Owe
- Oh Well – Usage & Meaning
- Ok vs. Okay – Usage & Difference
- Old chestnut
- Old Glory
- Old Habits Die Hard – Origin & Meaning
- Old Hat – Idiom, Origin & Meaning
- Old wives’ tale vs old wise tale
- Old-fashioned or old fashion
- Oldie But Goodie – Origin & Meaning
- Olfactory vs old factory
- Oligarchy vs monarchy
- Olive branch
- Ombré, Ombre or Hombre
- Omelet vs. omelette
- Omnibus vs ombudsman
- On a Tear – Meaning and Origin
- On a Wing and Prayer – Idiom, Meaning & Origin
- On Accident or By Accident – Usage & Examples
- On Cloud Nine – Origin & Meaning
- On fleek
- On one’s last legs
- On pins and needles
- On steroids
- On tenterhooks
- On the back burner
- On the Back Foot – Meaning, Origin and Synonyms
- On the Ball—A Deep Dive into Competence
- On the Bubble – Meaning and Origin
- On the Clock – Idiom, Origin and Meaning
- On the contrary
- On the Fence – Idiom, Origin & Meaning
- On the Fly – Meaning and Origin
- On the fritz
- On the House – Idiom, Origin and Meaning
- On the lam
- On the q.t.
- On the Rocks – Meaning and Origin
- On the Ropes – Expressing Helplessness or Instigating Fight Back
- On the Same Page – Idiom, Meaning & Origin
- On the stump and stump speech
- On the up and up
- Onboard vs. On board
- Once in a Blue Moon – Idiom, Meaning & Origin
- Once in a lifetime vs once-in-a-lifetime
- One and the same, one in the same
- One Fell Swoop – Origin and Meaning
- One For the Books – Origin and Meaning
- One for the money, two for the show
- One good turn deserves another
- One hand washes the other
- One Size Fits All – An Idiom For Every Situation
- One-hit wonder
- One-Horse Town – Meaning & Origin
- One-time vs. onetime
- One-Trick Pony – Meaning and Origin
- One-upmanship
- One’s eyes are bigger than one’s stomach
- Oneself vs. One’s Self – Definition and Usage
- Online vs. on-line
- Onomatopoeia
- Onus
- Oompa Loompa
- Op-ed
- Open and shut case
- Open Secret – Idiom, Meaning and Origin
- Operationalise or operationalize
- Opossum vs. possum
- Oppress, repress, suppress
- Oracle vs auricle
- Oral vs. verbal
- Ordinance vs. ordnance
- Organise vs. organize
- Orientate
- Origin or origins
- Ornery – Usage, Meaning & Examples
- Orthopedic vs. orthopaedic
- Other fish to fry and bigger fish to fry
- Ought vs. Aught
- Ours is not to reason why; ours is but to do and die
- Ouster
- Out and out
- Out of Left Field – Meaning and Origin
- Out of My League – Acknowledging Superiority or Just Self-Doubt
- Out of Pocket – Meaning, Origin, & Definition
- Out of Sight, Out of Mind – Usage & Meaning
- Out of Sorts – Idiom, Origin & Meaning
- Out of the blocks and off the blocks
- Out of the Blue – Idiom, Origin & Meaning
- Out of the blue vs out of the woodwork
- Out of the frying pan and into the fire
- Out of the Loop (In the Loop) – Indicating Ignorance or Knowledge?
- Out of the Woods – Idioms for Overcoming Difficulties
- Out of whole cloth
- Outset vs onset
- Outside of
- Over a Barrel – Origin & Meaning
- Over the Hump – Meaning and Origin
- Over the Top – Meaning & Origin
- Over- and under- (prefixes)
- Overbilled vs. Overbuild
- Overdo vs. overdue
- Overlook vs look over
- Overly
- Overnight vs. over night
- Overrate vs overate
- Oversee vs overlook
- Oversees vs. Overseas
- Overtake, take over and takeover
- Overthink vs think over
- Overtime vs over time
- Overtones vs. undertones
- Own Up – Meaning, Usage and Examples
- Oxymorons: A Collection of Contradictory Words and Phrases
- -Holic, -Oholic, and -Aholic – Suffix, Meaning & Examples
- Abject or object
- Abject vs object
- An ounce of prevention is worth a pound of cure
- Apposite vs opposite
- Approbation vs opprobrium
- Arcane and obsolete
- Aureole vs oriole
- Awed vs odd
- Carnivore, herbivore or omnivore
- Come over vs overcome
- Covert vs overt
- Decoding Under the Radar—From Unnoticed to Understood
- Downright vs outright
- Emission vs omission
- Everyone vs every one
- Gloves Are Off and Take the Gloves Off — Meaning & Origin
- Head on the chopping block and on the chopping block
- High Horse – Idiom, Meaning and Origin
- Hour vs our
- In Over My Head – An Overwhelming Challenge
- In the Cards or On the Cards – Idiom, Meaning and Origin
- Include, exclude or occlude
- Inpatient or outpatient
- My Name Is Mud – Meaning and Origin
- Noxious vs obnoxious