Toward or to the side; in the direction of the flank or side of something.
English compound of 'flank' plus '-wise' suffix (meaning direction or manner), following patterns like 'clockwise' or 'likewise.'
The '-wise' suffix is surprisingly flexible—you can add it to almost any noun to create a direction, which is why old military manuals are full of words like 'flankwise' that nobody uses anymore.
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