keg
barril, barril de cerveja = a small cask or barrel
keepsake
souvenir, lembrança = something kept or given to be kept as a memento; souvenir
kink
1) torcicolo; "a kink in the neck" / 2) onda (cabelo); dobra (papel) = a twist or curl, as in a thread, rope, wire, or hair; "a kink in the telephone cord" / 3) imperfeição = a flaw or imperfection likely to get in the way of the smooth operation of something, as a machine or plan
knapsack
mochila = backpack, rucksack
knavepatife, cafajeste