safe seat 
noun British
A parliamentary seat that is likely to be retained with a large majority in an election.McFadden last night insisted that the final decision on who defends Labour's 12,464 majority in the Midlands safe seat would be left with the members of the constituency party....
- They also tend to waste more of their votes piling up majorities in safe seats instead of capturing marginal ones.
- In fact Birmingham is looking a bit grim for Labour, with them expressing concern that they might lose Edgebaston, considered a relatively safe seat with a majority of 12.4%.
- one-back
- one-bar
- one-base
- one-baser
- one-berry
- one-book
- one by one
- one cannot live by bread alone
- one can't make an omelette without breaking eggs
- one catch all
- one-chase-all
- one-click
- one club
- one-coat
- one-colored
- one-coloured
- one could do something in one's sleep
- one could have bitten one's tongue off
- one could (or may) be forgiven for doing something
- one day
- one-dayer
- one-design
- on edge
- one-dimensional
- one-dimensionality