| insufflate | (verb) blow or breathe hard on or into | - |
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| (verb) treat by blowing a powder or vapor into a bodily cavity | - |
| (verb) breathe or blow onto as a ritual or sacramental act, especially so as to symbolize the action of the Holy Spirit | - |
| insulate | (verb) place or set apart | Synonyms: isolate |
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| (verb) protect from heat, cold, or noise by surrounding with insulating material | - |
| insult | (verb) treat, mention, or speak to rudely | Synonyms: affront, diss |
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| insure | (verb) be careful or certain to do something; make certain of something | Synonyms: ascertain, assure, check, control, ensure, see, see to it |
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| (verb) protect by insurance | Synonyms: cover, underwrite |
| (verb) make certain of | Synonyms: assure, ensure, guarantee, secure |
| (verb) take out insurance for | - |