burthen
bur·then ˈbər-t͟hən 
archaic variant of burden
- smart alec
- smart aleck
- smart alecks
- smart as a whip
- smart card
- smart cookie
- smart drug
- smart grass
- smart money
- smart move
- smart off
- smart phone
- smart phones
- smart set
- smart-aleck
- smart-aleckism
- smart-aleckisms
- smart-aleckries
- smart-aleckry
- smart-alecky
- smart-arse
- smart-ass
- smart-assed
- smart-mouth
- smart-mouthed