全力
ぜんりょく · zenryoku · JLPT N2 · noun
power
💪 全 (all) + 力 (power) = all one's power; say 'zen-RYO-ku' like 'zen' + 'ryoku' (ryoku = power, as in 'ryoku-ka')
全 means whole or all, 力 means strength or power. Together, 全力 means giving every bit of your strength, so think 'all power' every time you hear zenryoku.
全 — enter 入 on top + jade 玉
Originally written as 入 (enter) over 玉 (jade), depicting a complete, unflawed piece of jade kept in storage. From this image of a perfect jade came the meanings 'whole,' 'complete,' and 'entire.' The top component is sometimes written as 人.
力 — pictograph of a plow or arm muscle
力 originated as a pictograph of an ancient plow, the main tool requiring physical exertion in early agriculture. Some scholars also see it as a flexed arm showing muscle. From this concrete image it broadened to mean 'strength, power, force, effort'.