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give off
give something off
to release something, such as smoke, a noise, an odor, fragrance, etc. The little animal gave a foul smell off. The flower gave off its heavy perfume at dusk.
give off
Send out, emit, as in Certain chemical changes give off energy, or This mixture gives off a very strange odor. [Early 1800s]
give off
v. To emit, release, or radiate something: This chemical reaction gives off a lot of energy. The refrigerator gave off a strange odor.