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力いっぱい

with all one’s strength, as hard as possible

→ 力一杯
力 force; strength + いっぱい for the whole of, until the end of
adverb Rare #41,197
with all one’s strength, as hard as possible
JA: ドアを力いっぱい押した。
EN: I pushed the door with all my strength.

力いっぱい！

With all your might!

— かぐや姫の物語 (2013)

力いっぱい…助けて

Please, help me with all you've got...

— パディントン２ (2017)

私は一瞬考えてから、力いっぱい握った。

I paused for a moment, then squeezed as hard as I could.