If two things are superimposed, one is stacked over the other so that both become one.
If you impute something, such as blame or a crime, to somebody, you say (usually unfairly) that that person is responsible for it.
If you imbibe ideas, values, or qualities, you absorb them into your mind.
If something impinges on you, it affects you in some negative way.
An imbroglio is a very difficult, confusing, and complicated situation.
If you impugn someone's motives or integrity, you say that they do not deserve to be trusted.
An immanent quality is present within something and is so much a part of it that the object cannot be imagined without that quality.
If something, such as a product or book, has an official's imprimatur, that authority has given it their official approval.
An imminent event, especially an event that is unpleasant, is almost certain to happen within the very near future.
When you are impassioned about a cause or idea, you are very passionate or highly emotionally charged about it.
An impediment is something that blocks or obstructs progress; it can also be a weakness or disorder, such as having difficulty with speaking.
An impending event is approaching fast or is about to occur; this word usually has a negative force, such as something threatening coming.
An imposition is putting an extra burden or duty on someone that is not welcomed by that person.
When something is implicit, it is understood or implied without having to say it.
An impoverished person or nation is very poor and stricken by poverty.
If you act in an impulsive fashion, you tend to do things without thinking about them beforehand in a way that is not predictable.
When you reimburse someone, you pay back the money that you borrowed from them, or you repay them for damages or losses they have suffered because of you.
When you become immersed in a subject, you are so interested in it that you are completely absorbed or submerged in it.
When someone has an impact on something, they influence or affect it in some way.
When someone implements something, such as a plan, they carry it out or perform it.
To immolate is to sacrifice a victim, often by burning; this verb can also refer to killing something, again by fire.
To immure something is to confine or enclose it within walls; likewise, immuring someone is the incarceration of them.
When you impress someone, you do such a great job at something that the other person thinks it's really good and so is filled with praise for it.
When a country imports goods or items from another country, it brings those products into it to be sold.
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