1) The outshot was an extension built onto the side or rear of an existing building, and the suffix describes the projection thus made.
The first dictionary evidence for this word is a Yorkshire example of 1624, so it is likely to be a regional term. References occur commonly from the first part of the sixteenth century: 1533 buyld … one house to have two outshittes [sic] at either ende, Halifax
1538 2 outshoits joined to a new house lately of William Waddesworth, Sowerby
1542 le Owteshott near the cemetery, Huddersfield. Two of these spellings clearly point to the influence of dialect on ‘shoot’ as the suffix. The frequency of the word in those years may imply that building such extensions was only then becoming popular in that part of Yorkshire, and a variety of almost explanatory examples have been noted subsequently: 1594 one messuage, one owtshott adjoined and affixed to the said messuage, Kirkheaton
1666 in the Outshoote joining to the Kill, Brayton. In the seventeenth century, the spelling ‘outshut’ became more frequent and the term was increasingly taken as a synonym of ‘eyling’: 1604 one eling or outshutt adjoining the said bay, Hopton
1640 a house and barn and le Outshutt or Eelinge adjoining, Holme.