クリスマス以来、ずいぶん太ってしまった。

I've put on a lot of weight since Christmas.

クリスマス以来(いらい)、ずいぶん太(ふと)ってしまった。

Kurisumasu irai, zuibun futotteshimatta.

クリスマス (クリスマス)

Christmas

以来 (いらい)

since; henceforth

随分 (ずいぶん)

very; extremely; surprisingly; considerably; contemptible; reprehensible

太る (ふとる)

to grow fat (stout, plump); to become fat; to gain weight

Readings: イ、もっ.て

Meanings: by means of, because, in view of, compared with

Readings: ライ、タイ、く.る、きた.る、きた.す、き.たす、き.たる、き、こ

Meanings: come, due, next, cause, become

Readings: タイ、タ、ふと.い、ふと.る

Meanings: plump, thick, big around