adverb
to one's heart's content; with all one's might; hard
Adverbial use: doing something fully, without holding back, or with great force. Often used with verbs like 遊ぶ, 泣く, ぶつける, やる.
See also: 思いっきり
今日は思い切り遊んだ。
I played to my heart's content today.
彼は壁に思い切りぶつかった。
He crashed hard into the wall.
noun
resolution; determination; resignation
Noun use: the act of making up one's mind, often with a sense of resolve or acceptance. Common in phrases like 思い切りがいい (decisive) or 思い切りがつく (to make up one's mind).
彼は思い切りがいい。
He is decisive.
なかなか思い切りがつかない。
I just can't make up my mind.