n.
Pronunciation: ˌ ə n-d ə r- ə - ' ch ē -v ə r
Function: noun
Date: 1952
: one (as a student) that fails to attain a predicted level of achievement or does not do as well as expected
– un · der · achieve \ - ə - ' ch ē v \ intransitive verb
– un · der · achieve · ment \ -m ə nt \ noun