inseminate

The word "inseminate" has a clear main meaning and a rarer figurative one. In its usual sense, it means to introduce sperm into a female reproductive system in order to cause fertilization. This is the standard word in animal breeding, veterinary science, and some medical discussions of human reproduction, especially in the phrase "artificial insemination." The image behind the word comes from sowing seed.

By extension, the word can also be used figuratively to mean planting an idea, belief, feeling, or influence in someone's mind. This use is much less common in everyday English and often sounds literary, formal, or intentionally provocative because of the biological link. For that reason, writers may choose it when they want the image of something being deliberately planted so it can grow later.

For example, a farmer may inseminate cattle as part of a breeding program. In a figurative sentence, a novelist might write that a speech inseminated the crowd with hope or doubt. That said, many speakers would more naturally say "plant an idea" in ordinary conversation.

So, for most learners, the safest understanding is the literal one: introducing sperm for fertilization. The figurative meaning exists and can be effective in writing, but it is not the everyday use and should be chosen with care.