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 ?
The drying grass gave off 10 times more VOCs than did freshly cut leaves, the researchers report in the April 1 GEOPHYSICAL RESEARCH LETTERS.
The Joliot-Curies investigated and decided that in some cases the aluminum nucleus, after absorbing the alpha particle, gave off a neutron.
The traditional bread, however, gave off higher concentrations of malty-smelling compounds called Strecker aldehydes than did the industrial bread.
He determined that each gram of radium gave off 140 calories per hour.
On the Caribbean island of Montserrat, underwater thermal springs just off the coast gave off clues of mounting danger before the Soufriere Hills Volcano erupted there in 1995, according to British researchers.
Sure enough, the polyurethane coating used to attach the paper filters to their metal frames gave off a phosphorus-containing substance.
Scientists have known about sonoluminescence since 1934, when two German physicists aimed sound waves at water and created clouds of bubbles that gave off light.
When the crew brought the cores up to the ship, the rock gave off potentially lethal doses of gas, forcing the workers to don special breathing equipment, Francis and Robert E.