| oscillate | (verb) move or swing from side to side regularly | Synonyms: vibrate |
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| (verb) be undecided about something; waver between conflicting positions or courses of action | Synonyms: hover, vacillate, vibrate |
| osculate | (verb) touch with the lips or press the lips (against someone's mouth or other body part) as an expression of love, greeting, etc. | Synonyms: buss, kiss, snog |
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| (verb) have at least three points in common with | - |
| (verb) be intermediate between two taxonomic groups | - |
| ossify | (verb) become bony | - |
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| (verb) cause to become hard and bony | - |
| (verb) make rigid and set into a conventional pattern | Synonyms: petrify, rigidify |
| ostentate | (verb) display proudly; act ostentatiously or pretentiously | Synonyms: flash, flaunt, show off, swank |
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| ostracise | (verb) avoid speaking to or dealing with | Synonyms: ostracize |
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| (verb) expel from a community or group | Synonyms: ban, banish, blackball, cast out, ostracize, shun |
| ostracize | (verb) avoid speaking to or dealing with | Synonyms: ostracise |
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| (verb) expel from a community or group | Synonyms: ban, banish, blackball, cast out, ostracise, shun |