underachieve

From under- +‎ achieve.

• IPA^(key): /ˌʌndə(ɹ)əˈt͡ʃiːv/

• Audio (US):

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underachieve (third-person singular simple present underachieves, present participle underachieving, simple past and past participle underachieved)

1. To achieve less than expected; to fail to fulfil one's potential.

• punch below one's weight, underperform

• underachiever