Definition of overpromise in English:
overpromise
verbˈəʊvəˌprɒmɪsˈoʊvərˌprɑməs
[no object]Promise more than one is able to do or give.
if you overpromise and under-deliver, you frustrate your customer
they'll overpromise on jobs
with object he's careful not to overpromise the benefits
Definition of overpromise in US English:
overpromise
verbˈōvərˌpräməsˈoʊvərˌprɑməs
[no object]Promise more than one is able to do or give.
if you overpromise and under-deliver, you frustrate your customer
they'll overpromise on jobs
with object he's careful not to overpromise the benefits