ちから一杯 いっぱい
chikaraippai

Adverb
Expression

1. with all one's strength; with might and main; as hard as one can

かれ ちからいっぱい ったが、岩 いわはびくともしなかった。
karewa chikaraippai hippattaga iwawa bikutomo shinakatta.
He pulled with all his strength, but the rock would not move.
Other forms: