Etymology
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conceal (v.)

early 14c., concelen, "to keep close or secret, forbear to divulge," from Old French conceler "to hide, conceal, dissimulate," from Latin concelare "to hide," from con-, here perhaps an intensive prefix (see con-), + celare "to hide" (from PIE root *kel- (1) "to cover, conceal, save"). From early 15c. as "to hide or shield from observation." Replaced Old English deagan. Related: Concealed; concealing; concealable.

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Definitions of conceal

conceal (v.)
prevent from being seen or discovered;
Synonyms: hide
conceal (v.)
hold back; keep from being perceived by others;
She conceals her anger well
Synonyms: hold back / hold in
From wordnet.princeton.edu