on boardprepOn or in (a means of transportation).
on buttprep_phraseActing in a strange or deranged manner; tripping out, wilding.
on callprep_phraseAvailable to be summoned.
on cameraprep_phraseIn a position or situation where one is being photographed or filmed.
on cloud nineprep_phraseIn a state of elation; very happy; blissful.
on commandprep_phraseWhen it is ordered or desired; through conscious volition.
on contactprep_phraseImmediately after being impacted or touched by something.
on courseprep_phraseFollowing the intended route.
on cueprep_phraseExactly when expected or appropriate.
on dead dogsadvUsed to express that the speaker is telling the truth.
on deckprep_phraseOn the deck of a ship, especially of a captain or officer; in charge.
on deck circlenounThe circle drawn or painted on the field where the next batter to hit waits.
on dutyprep_phraseActively engaged in an assigned task, duty or occupation.
on earthprep_phraseExpletive used for emphasis after an interrogative word.
on edgeprep_phraseTense, nervous; consequently irritable.
on endprep_phrasewithout interruption, without stopping, continuously
on equal termsprep_phraseWith the same set of advantages and disadvantages; on an equal footing, on a level playing field.
on fileprep_phraseIn a file, as a file folder; available for reference.
on fireprep_phraseBeing burned by fire.
on firecallprep_phraseOn call, with regard to a firefighter or unit.
on first-name termsprep_phraseFamiliar with someone, such that one can address them by their first name.
on fleekprep_phraseFlawless; perfect; spot on.
on footprep_phraseOn one's feet; walking, jogging or running but not in a vehicle or on the back of an animal.
on formprep_phraseDoing well; performing as well as would usually be expected.
on Godprep_phraseWith all honesty and seriousness; affirmatively
on guardadjThe starting position of a fencing bout.
on handprep_phraseAvailable; ready; in stock.
on highprep_phraseTo a high position; or up in, or to, the sky; above.
on holdprep_phraseDelayed; postponed; suspended.
on iceprep_phraseNot being used; temporarily unavailable or suspended; on hold.
on impulseprep_phraseWithout prior consideration; spontaneously, impulsively.
on instrumentsprep_phrase(Flying) by reference to one's flight instruments, rather than by visual contact with the ground.
on itprep_phraseActively doing something, or working to solve a (specified) problem.
on its meritsprep_phraseConsidering only intrinsic good points and bad points, without prejudice or other considerations, such as procedural ones.
on Jahprep_phraseSynonym of on God.
on jobadjVery hardworking; dedicated to the hustle.
on keelprep_phraseMoving straight ahead without wobbling or tilting. (of a watercraft, etc.)
Spelling & Dictionary Insight
The English alphabetical index for the letter O contains 15,494 headwords drawn from our Wiktionary-derived dictionary table. At 50 entries per page the browse splits into 310 pages, and you are currently viewing page 93. Every row above is a dictionary-backed entry with a canonical slug, and each links through to a full definition page with pronunciation, senses, etymology, and related-word data where available.
On this page 50 of 50 entries carry a part-of-speech tag and 50 carry at least one stored definition. Coverage varies across letters because Wiktionary volunteers build entries at different speeds for different parts of the alphabet, letters with common starting sounds (S, C, T, P) usually have the densest coverage, while less frequent starters (X, Q, Z) tend to have shorter but more specialised lists. PlainSpell surfaces whatever data is present and links back to the source when a definition is not yet recorded.
For readers using this index as a spelling reference, the guarantee is that every form you see on the list is a documented English headword, not a guess, not a derived inflection lacking a lemma row. If a word you expected to find is absent from the "O" list, it usually means the form exists only as an inflection of another lemma (e.g. a past participle stored under the infinitive) or the entry has not yet been imported from Wiktionary. Use the search bar or the misspelling lookup to resolve these cases.