Word Study
unmoor
CIDE DICTIONARY
unmoor, v. t. [1st pref. un- + moor.].
To cause to ride with one anchor less than before, after having been moored by two or more anchors. [1913 Webster]
unmoor, v. i.
To weigh anchor. Sir W. Scott. [1913 Webster]
OXFORD DICTIONARY
unmoor, v.tr.
1 (also absol.) release the moorings of (a vessel).
2 weigh all but one anchor of (a vessel).
1 (also absol.) release the moorings of (a vessel).
2 weigh all but one anchor of (a vessel).
For further exploring for "unmoor" in Webster Dictionary Online