sweep under the rug
— Verb
– English
～ to conceal something in the hopes it won't be discovered by others; "The president tried to sweep the embarrassing incident under the rug"
going under
— Noun
– English
～ (of a ship) sinking
contract under seal
— Noun
– English
～ a contract that is signed and has the (wax) seal of the signer attached
underachieve
— Verb
– English
～ perform less well or with less success than expected; "John consistently underachieves, although he is very able"; "My stocks underperformed last year"
underachievement
— Noun
– English
～ poorer than expected performance (poorer than might have been predicted from intelligence tests)
underachiever
— Noun
– English
～ a student who does not perform as well as expected or as well as the IQ indicates
underact
— Verb
– English
～ act (a role) with great restraint
underactive
— Adjective
– English
～ abnormally inactive
underage
— Adjective
– English
～ not of legal age; "minor children"
underage
— Adjective
– English
～ dependent by virtue of youth
underarm
— Adverb
– English
～ with the hand swung below shoulder level; "throwing a ball underarm"
underarm
— Adjective
– English
～ with hand brought forward and up from below shoulder level; "an underhand pitch"; "an underhand stroke"
underbelly
— Noun
– English
～ the soft belly or underside of an animal's body
underbelly
— Noun
– English
～ the quality of being weak or unprotected; "the soft underbelly of the Axis"- Winston Churchill
underbelly
— Noun
– English
～ lower side; "the underbellies of clouds"
underbid
— Verb
– English
～ bid (a hand of cards) at less than the strength of the hand warrants