give off

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give off

To emit, discharge, or radiate something. A noun or pronoun can be used between "give" and "off." The heater is giving off a strange smell these days. She really gives off an angry vibe, so I thought she disliked me for the longest time!
See also: give, off
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

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.
See also: give, off
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

give off

Send out, emit, as in Certain chemical changes give off energy, or This mixture gives off a very strange odor. [Early 1800s]
See also: give, off
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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.
See also: give, off
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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References in periodicals archive ?
"And it gives off a lot more smell for a lot less perfume than spraying it all over the body."
When a caterpillar devours a plant, the plant gives off chemical scents that warn neighbors to defend themselves.
When it encounters and binds to certain chemical derivatives of either of the gases, however, the polymer gives off additional light at a more yellow wavelength.
The crash also gives off lots of energy - so much that some scientists believe antiatoms could one day be used as a lightweight rocket fuel for interstellar space travel.
In other words, the feeling the music gives off is that as a talisman the Fourth of July not only preceded the Declaration of Independence but called it into being.
Inside a cell, the two carbon atoms in each acetic acid molecule are eventually expelled as carbon dioxide in a reaction that gives off a packet of energy.
The girl has her hands on a Van de Graaff generator, a machine that gives off electrons (negatively charged particles).
Consequently, joining forces with a bacterium that gives off all three as waste products of its metabolism would have given such an archaeon a major advantage--another food supply.
That chemical reaction gives off a burst of heat--enough to heat your meal.
When the scientists mixed up this material as a bulk powder, it proved better than the standard commercial red phosphor, which gives off a more orange-colored light.
That view enabled astronomers to measure how much ultraviolet and visible light the star gives off. The higher the ratio of ultraviolet light to visible light, says Heap, the hotter the star.
For 6 years, since they discovered it gives off light when electricity passes through it, scientists in Cambridge, England, have set their sights on a plastic called PPV.
For more than a decade, taxonomists had classified this chunky, short-tailed bird as part of the Hawaiian honeycreeper family, which gives off an odor resembling that of a musty canvas tent.
in Santa Barbara, Calif., have gotten rid of the stiff metallic electrodes typically used to excite the polymer so that it gives off light.