sun deck 
noun
1The deck, or part of a deck, of a yacht or cruise ship that is open to the sky.There is a large saloon and sun deck, open bar (included in the charter rate) and good food and snacks throughout the day....
- They walked up the stairs to the open sun deck, which was already crowded with people.
- From the sun deck we can look out over the marina at everyone else looking at us.
2North American A terrace or balcony positioned to catch the sun.It also features a master bedroom suite with sun deck and an indoor-outdoor pool....
- The Sheraton Commander Hotel includes a Harvard Square location, fitness center with sun deck, and newly renovated rooms.
- To help bring Erskine's apartments back into scale with the rest of the development sun decks, terraces and balconies have been added to all apartments, protruding from many different areas that help lose the flat facade of the blocks.
- at the coalface
- at the door
- at the double (on the double)
- at the drop of a hat
- at the earliest
- at the end of the day
- at the end of the rainbow
- at the expense of
- at the furthest
- at the instance of
- at the latest
- at the least (or very least)
- at the mercy of
- at the minute
- at (the) most
- at the (or this) moment
- at the outside
- at the ready
- at the risk of doing something
- at the same time
- at the slope
- at the top (or bottom) of the heap
- at the trail
- at the wicket
- at this moment in time