. (Aëronautics) The front edge (in direction of motion) of a supporting surface; -- contr. with following edge, which is the rear edge. [ Webster 1913 Suppl. ]
. (Aëronautics) The first of two or more surfaces arranged in tandem; -- contr. with following surface, which is the rear surface. [ Webster 1913 Suppl. ]
[いっしんいったい, isshin'ittai](n, vs, adj-no) now advancing and now retreating; ebb and flow; seesawing; taking alternately favorable and unfavorable turns[Add to Longdo]
[しゅっしょしんたい, shusshoshintai](n) advancing and retreating; appearance and disappearance; one's daily activities; one's course of action; one's attitude[Add to Longdo]
[わき, waki](n) (1) welling (up); gushing forth (of water); springing out; surging; (2) appearing (esp. suddenly); (3) frothing of water (due to an advancing school of fish)[Add to Longdo]