bases, fort, rampart, walls, base(ball)
塁 centers on a raised, layered structure built for defense or as a foundation: a fort, rampart, or wall. The baseball base sense is a modern extension of that same idea of a marked, raised spot.
塁 is the modern simplified form of 壘. The older form uses 畾 (a triple field/stone shape) over 土, suggesting piled earth or stones for a rampart. The modern form simplifies the top to a single 田.
The top 田 looks like a field, and the bottom 土 is earth. Picture layers of earth piled up like a terraced field to build a fort or rampart. In baseball, the bases are like small raised earth platforms.
For ルイ, imagine a fort built from layered ruins: ruins -> ルイ, and the piled stones form the rampart.
base; bag; sack
bases loaded
home run
base stealing; steal; stolen base
getting on base; reaching first base
first base
third base
two-base hit; double
second base
base hit
base; stronghold; main fort
three-base hit; triple
second baseman
base umpire
third baseman
left on base
first baseman
first-base line
third-base line
on-base percentage