push-pull

[poosh-pool]
noun
1.
Radio. a two-tube symmetrical arrangement in which the grid excitation voltages are opposite in phase.
adjective
2.
of or pertaining to electronic devices having components with balanced signals opposite in phase.

Origin:
1925–30

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
push-pull
 
n
using two similar electronic devices, such as matched valves, made to operate 180° out of phase with each other. The outputs are combined to produce a signal that replicates the input waveform: a push-pull amplifier

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
It's a push-pull that city politicians have long been accustomed to balancing.
The push-pull of a sleazy guy slowly accepting his role as a prophet would have made the show more daring and fun.
There are a lot of ways the push-pull between simplicity and complexity is being explored and explained.
The vixen and the preppy engage in a push-pull romance, and each is hampered by neglectful, doomed dads.
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