adieu
...to make one's adieus, to take

apprenticeship
...to serve one's apprenticeship with somebody

BOGOF
buy one, get one free

brow
...to bend one's brow / to crease

fo.
folio (one sheet)

gruel
...to have one's gruel / to get

haul down
...haul down one's flag / to haul down

Jimmy
Jimmy the One

one
four ones

one-cylinder
one-cylinder engine

one-dimensional
unidimensional

one-eared
monauricular

one-footed
monópode

one-leaved
unifoliado

one-legged
que tem uma perna só

one-liner
piada curta

one-man
one-man job

one-pair
no primeiro andar

one-parent
one-parent family

one-phase
one-phase circuit

one-piece
one-piece bathing suit

one-price
one-price store

one-reeler
curta-metragem

one-shot
eficaz à primeira

one-sidedly
com parcialidade

one-to-one
one-to-one tuition

one-way
one-way street

twenty-one
vinte-e-um

wend
to wend one's way to