めいっぱい
to the limit; to the full; as much as possible; with all one's might
Also written 目いっぱい
Adverb, No-adjective, Na-adjective, Noun
目一杯めいっぱい楽たのしんでね！
Have as much fun as you can!
政治家せいじかとして、彼かれは、演技えんぎのうまさを目一杯めいっぱい活用かつようしている。
As a politician, he makes utmost use of his acting ability.