
1) Electronic countermeasures 2) Electronic jamming
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https://www.crosswordclues.com/clue/jamming

1) Overcrowding 2) Tying up
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https://www.crosswordclues.com/clue/jamming

Serving or returning straight into the opponent's body.
Found on
http://en.wikipedia.org/wiki/Glossary_of_tennis_terms
[dance] Jamming in dance culture is a kind of informal show-off during a social dance party. Dancers clear a circle (jam circle or dance circle) and dancers or dance couples take turns showing their best tricks while the remaining dancers cheer the jammers on. While some jam circles are staged, most form organically and spontaneously when t...
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http://en.wikipedia.org/wiki/Jamming_(dance)
[physics] Jamming is the physical process by which some materials, such as granular materials, glasses, foams, and other complex fluids, become rigid with increasing density. The jamming transition has been proposed as a new type of phase transition, with similarities to a glass transition but very different from the formation of crystallin...
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http://en.wikipedia.org/wiki/Jamming_(physics)

Slow convergence, perhaps to a non-solution point -- see zigzag phenomenon.
Found on
http://glossary.computing.society.informs.org/index.php?page=J.html

The various techniques that were used to over power, confuse and distort the radar and radio-location equipment used by the enemy. Many ingenious methods were employed an both sides to fool the other.
Found on
http://histru.bournemouth.ac.uk/Oral_History/Talking_About_Technology/radar

• (p. pr. & vb. n.) of Jam
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http://thinkexist.com/dictionary/meaning/jamming/

in electronics, broadcasting a strong signal that overrides or obscures a target signal. Jamming of radio and television stations broadcasting from ...
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http://www.britannica.com/eb/a-z/j/6

to hit the tennis ball straight to the opponent's body not allowing them to extend the racquet to hit the ball well.
Found on
http://www.ducksters.com/sports/tennisglossary.php

deliberate interference, caused by emissions intended to render unintelligible or falsify the whole or part of a wanted signal
Found on
http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=713-11-23

to serve or return straight to the opponent's body
Found on
http://www.translationdirectory.com/glossaries/glossary148.htm

[
n] - deliberate radiation or reflection of electromagnetic energy for the purpose of disrupting enemy use of electronic devices or systems
Found on
http://www.webdictionary.co.uk/definition.php?query=jamming

When the combined diameters of three cables roughly equal the interior diameter of the conduit, the cables can line up linearly as they are pulled around the bend. The cables then wedge against the conduit wall as they are forced towards the inside of the
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http://www.youngco.com/young2.asp?ID=4&Type=3

Packing a body part such as a foot or hand into a crack.
Found on
https://rockclimbingcentral.com/rock-climbing-glossary-217-climbing-terms-y

a technique used for climbing a crack where you jam your feet and hands in it
Found on
https://www.alter-rock.co.uk/an-a-z-of-indoor-climbing-terms/
electronic jamming noun deliberate radiation or reflection of electromagnetic energy for the purpose of disrupting enemy use of electronic devices or systems
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.