water's edge;  shore;  waterside
 performance;  execution;  skill;  dexterity;  tact
 the point just before;  the point of doing;  the verge of happening
 close to the wall;  alongside the wall
 time of departure;  (on the) point of departure;  just as one is leaving
 one's last moments;  (on) the point of death;  (on) one's deathbed
 moment to quit;  way to quit
 beach;  water's edge;  coastline;  national border;  before entering the country
 brink of death;  time to give up;  knowing when to give up
 mountain ridge;  near a mountain
 edge of the ring;  verge;  brink;  critical moment
 ball control;  focus on the ball
 on the verge of sleep;  just after falling asleep
 base (of a stem, tree trunk, pillar, etc.)