uncover (to)
descobrir, revelar = to discover, to disclose, to reveal
underline (to)
sublinhar
underpants
1) cueca (US) = briefs, boxer (cueca samba-canção) // 2) calcinha (UK) = pants
undertakeragente funerário = funeral director
underwear
roupa de baixo; roupa íntima = clothing worn next to the skin under outer clothes
underwriting

1) subscrição, lançamento ações / 2) aceitação (seguro)
undue1) não vencido = not yet due; not yet payable / 2) injusto, indevido = unjust, improper, or illegal
unravel (to)
desembaraçar, desemaranhar, desenredar
untenable
insustentável = not able to be defended; not able to be occupied
unwind (to) [anwaind]1) desenrolar-se / 2) relaxar = to relax
upheavaltranstorno; convulsão = a strong, sudden, or violent disturbance, as in politics, social conditions, etc; political upheaval = revolta política, golpe de estado
uphold (to)apoiar, defender, sustentar = to support or defend (something, such as a law); to give support to
uproartumulto, alvoroço, algazarra = turmoil
usher / usher (to)1) porteiro = doorkeeper / 2) lanterninha (cinema, teatro) = a person who escorts people to seats in a theater, church, etc. // conduzir, escoltar
utmost (adj) / utmost (n)máximo, extremo, maior, mais distante; "utmost importance" ; "the utmost reef of the island" // o máximo; o extremo; todo o possível; "he did his utmost"