A fold was a pen or enclosure for animals, and the inference is that it must often have been a temporary structure, made by fastening hurdles, bars or ‘fleaks’ to fixed stakes.
Literally the front embankment: the word ‘bay’ could mean a dam or embankment and by an extension of its meaning ‘forebay’ came also to allude to the reservoir.
The various meanings given for foreland in the OED are not relevant to the use of the word in Yorkshire where it referred to land which formed part of an expanded open field system.
Typically found in the plural, with the same meaning as ‘crucks’. These were pairs of curved timbers which met at the top point of the roof and supported the roof tree.