SYN: Exertion, use, practice, application, training, employment, drill.
ANT: Rest, ease, relaxation, recreation.
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KEY: Exertion.
SYN: Effort, labor, toil.
ANT: Relaxation, recreation, rest.
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KEY: Exhalation.
SYN: Mist, damp, effluvium.
ANT: Absorption, exsiccation, inhalation.