"undervaluing" in the verb sense
1. undervalue, underestimate
assign too low a value to
"Don't underestimate the value of this heirloom-you may sell it at a good price"
2. undervalue
esteem lightly
3. depreciate, undervalue, devaluate, devalue
lose in value
"The dollar depreciated again"
Source: WordNet® (An amazing lexical database of English)
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