underachieve
US
UK underachieve, under-achieve vi: (perform poorly)
SC （学习）成绩不良 xué xí chéng jì bù liáng
SC 未能充分发挥（学习）潜能 xué xí chéng jì bù liáng，wèi néng chōng fèn fā huī xué xí qián néng
Children from poor families are more likely to underachieve at school.