to jump into, to leap into, to dive into, to plunge into, fly into / to come rushing in / to butt in

big, large, great

to open / to make (a hole)

to broaden; to become wide / to develop; to progress; to improve / (of a person) to be enlightened; to be inspired; (perfect tense) to be sharp or clever

room (of a house or hotel), chamber, apartment, flat / (sumo) a stable where rikishi live and train together under a shisho oyakata (stable master)

(Internet slang, dated) Windows (an operating system)

ガ: moth

The katakana syllable ガ (ga). Its equivalent in hiragana is が (ga).

window

window / (regional, dialect, Etchū region) a deep gap in a mountain ridge (so called for the way the wind blows through, like a window)