regress

[v. ri-gres; n. ree-gres]
verb (used without object)
1.
to move backward; go back.
2.
to revert to an earlier or less advanced state or form.
noun
3.
the act of going back; return.
4.
the right to go back.
5.
backward movement or course; retrogression.

Origin:
1325–75; Middle English regresse (noun) < Latin regressus a returning, going back, equivalent to re- re- + -gred-, combining form of gradī to step, walk, go + -tus suffix of v. action, with dt > ss

regressor, noun


1. revert, retreat, backslide, lapse, ebb.
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World English Dictionary
regress
 
vb
1.  (intr) to return or revert, as to a former place, condition, or mode of behaviour
2.  (tr) statistics to measure the extent to which (a dependent variable) is associated with one or more independent variables
 
n
3.  the act of regressing
4.  movement in a backward direction; retrogression
5.  logic a supposed explanation each stage of which requires to be similarly explained, as saying that knowledge requires a justification in terms of propositions themselves known to be true
 
[C14: from Latin regressus a retreat, from regredī to go back, from re- + gradī to go]
 
re'gressor
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

regress
late 14c. (n.), "act of going back," from L. regressus "a return," from regress-, pp. stem of regredi "to go back," from re- "back" + gradi "to step, walk" (see grade). The verb meaning "to move backward" is recorded from 1823; the psychological sense of "to return to an earlier
stage of life" is attested from 1926. Regressive is recorded from 1630s; in ref. to taxation, it is attested from 1889.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Rather, sharks have regressed from wider heads to narrower ones.
Brand has regressed badly this season, looking slow and out of shape.
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