| opacify | (verb) become opaque | - |
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| (verb) make opaque | - |
| opalesce | (verb) exhibit a play of colors like that of an opal | - |
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| (verb) reflect light or colors like an opal | - |
| opalise | (verb) replace or convert into opal | Synonyms: opalize |
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| (verb) make opalescent | Synonyms: opalize |
| opalize | (verb) replace or convert into opal | Synonyms: opalise |
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| (verb) make opalescent | Synonyms: opalise |
| open | (verb) make available | Synonyms: open up |
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| (verb) become available | Synonyms: open up |
| (verb) make the opening move | - |
| (verb) cause to open or to become open | Synonyms: open up |
| (verb) become open | Synonyms: open up |
| (verb) spread out or open from a closed or folded state | Synonyms: spread, spread out, unfold |
| (verb) display the contents of a file or start an application as on a computer | - |
| (verb) afford access to | Synonyms: afford, give |
| (verb) start to operate or function or cause to start operating or functioning | Synonyms: open up |
| (verb) begin or set in action, of meetings, speeches, recitals, etc. | - |
| (verb) have an opening or passage or outlet | - |
| operate | (verb) perform surgery on | Synonyms: operate on |
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| (verb) perform a movement in military or naval tactics in order to secure an advantage in attack or defense | Synonyms: maneuver, manoeuver, manoeuvre |
| (verb) handle and cause to function | Synonyms: control |
| (verb) keep engaged | Synonyms: engage, lock, mesh |
| (verb) perform as expected when applied | Synonyms: function, go, run, work |
| (verb) direct or control; projects, businesses, etc. | Synonyms: run |
| opine | (verb) expect, believe, or suppose | Synonyms: guess, imagine, reckon, suppose, think |
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| (verb) express one's opinion openly and without fear or hesitation | Synonyms: animadvert, sound off, speak out, speak up |
| oppose | (verb) be resistant to | Synonyms: contradict, controvert |
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| (verb) be against; express opposition to | - |
| (verb) set into opposition or rivalry | Synonyms: match, pit, play off |
| (verb) fight against or resist strongly | Synonyms: defend, fight, fight back, fight down |
| (verb) act against or in opposition to | Synonyms: react |
| (verb) contrast with equal weight or force | Synonyms: counterbalance |
| oppress | (verb) come down on or keep down by unjust use of one's authority | Synonyms: crush, suppress |
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| (verb) cause to suffer | Synonyms: persecute |
| oppugn | (verb) challenge the accuracy, probity, or propriety of | Synonyms: call into question, question |
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| opsonize | (verb) make (cells) more susceptible to the action of phagocytes | - |
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| opt | (verb) select as an alternative over another | Synonyms: choose, prefer |
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| optimise | (verb) act as an optimist and take a sunny view of the world | Synonyms: optimize |
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| (verb) make optimal; get the most out of; use best | Synonyms: optimize |
| (verb) modify to achieve maximum efficiency in storage capacity or time or cost | Synonyms: optimize |
| optimize | (verb) act as an optimist and take a sunny view of the world | Synonyms: optimise |
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| (verb) make optimal; get the most out of; use best | Synonyms: optimise |
| (verb) modify to achieve maximum efficiency in storage capacity or time or cost | Synonyms: optimise |