Floating Rook

…When it is on the first line, it is called an edge attack, and usually the bishop is raised and the rook is moved underneath it. A strategy in which the rook is placed forward from its original position (usually two steps forward). A strategy in which the side pawn capture static rook is used to push forward and exchange the pawn in front of the bishop, and capture the enemy pawn immediately next to it. …

*Some of the terminology explanations that refer to "floating rook" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…1筋の場合は端攻めといい，普通は香を上げてその下に飛車を移す。　浮き飛車飛車を原位置より前方(普通は2段前方)に置いて戦う戦法。　横歩取り居飛車で飛先の歩を突き進めて交換し，すぐ横の敵歩を取る戦法。…

※「浮き飛車」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報