"mistaking" in the noun sense
1. misinterpretation, misunderstanding, mistaking
putting the wrong interpretation on
"his misinterpretation of the question caused his error"
"there was no mistaking her meaning"
"mistaking" in the verb sense
1. mistake, misidentify
identify incorrectly
"Don't mistake her for her twin sister"
2. err, mistake, slip
to make a mistake or be incorrect
Source: WordNet® (An amazing lexical database of English)
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