"fluid border" is a correct and usable phrase in written English.
It is generally used to describe a border that is flexible or unconstrained, such as the border between two countries that has no restrictions on movement between the two. For example, "The fluid border between the United States and Canada has meant that citizens of both countries can easily travel and work in either country."
We live on the fluid border between public and private – and we have new, sometimes confounding opportunities to crisscross that line.
On his deathbed, Stefan reverts to his native tongue, and "the lines of immigration shifted once again, a fluid border, spilling... across distance and time".
Here are a few: the lack of an Alex Salmond-type leader, the demise of Labour in Scotland compared with the party's grip on power in Wales and the large fluid border with England.
Her writing of women's bodies, like her retrieval of mother/daughter genealogies is a strategy of language and imagination, situating the body as fluid border, the site of the overflow of culture into nature and vice versa, rather than a self-enclosed egoic center.
Accordingly, the questions were designed to include the descriptions of some practices that are currently illegal in both the UK and New Zealand, and others which are on the potentially fluid border of legality, the assumption being that there is greater risk of doctors not willing to provide honest answers to illegal or questionably legal practices.
All three have come to Zurich from the former Yugoslavia, a place whose fluid borders have produced mixed identities and impermanent kinships.
By buying in relatively small quantities and taking advantage of the fluid borders of the European Union, most manage to avoid paying import tariffs.
Disarming the Sunni groups while allowing the peshmerga (beyond the fluid borders of the KRG) and Shia Badr brigades and the Mahdi army to remain armed is a difficult task.
Re "On Africa's Fluid Borders, My Land Is Your Land" (news article, April 16): Articles about Africa often endorse the view that the continent's political and economic troubles stem from the "absurd" borders constructed by the European colonial powers, which are said to unnaturally divide and lump together ethnic groups.
Modern international travel, widespread migration, and fluid borders all facilitate the more rapid spread of pandemic influenza viruses.
Chip designs can be classified according to the method of creating isolated compartments, with either solid borders materialized by microchambers, microwells, microvalves, etc., or fluid borders, in particular, microemulsions 13.
