adverb taking the 'to' particle
very high; high up; aloft
Describes something being physically high or elevated; often used with と to modify a verb.
鳥が高々と空を飛んでいる。
A bird is flying high up in the sky.
adverb
Used to indicate an upper limit or a modest amount; often followed by a number or quantity.
この仕事はたかだか一時間で終わる。
This job will take at most an hour.
彼の給料はたかだか二十万円だ。
His salary is no more than 200,000 yen.