'A Square Meal'
The saying having a square meal comes from the English Royal Navy during the time of Nelson. In order to stop the plates/ dishes slipping around on the table when the ship was at sea, four pieces of wood were nailed to the benches in the shape of a square to stop the plates from slipping... hence 'having a square meal'.
‘Show a Leg’
Apparently, when the ships of old were about to leave port, the sailors might try to smuggle a lady aboard, concealing her in their hammock. The officers or mates would do a final inspection of the ship and crew before she left. Anybody in a hammock was bidden to 'show a leg'. Should a hairless and shapely one dangle the owner was usually a Jill not Jack Tar and eviction swiftly followed!