This means something starts suddenly. It often feels like it is rising up or becoming clear.
Verb [stem] + 立つPrimary
This means something starts suddenly. It often feels like it is rising up or becoming clear.
彼は世界一周の旅に出ようと思い立った。
He suddenly decided to set out on a trip around the world.
彼は些細なことでは苛立たない。
He doesn't get irritated by trivial things.
沸き立つお湯に気をつけてください。
Please be careful with the boiling water.
飛行機が轟音とともに飛び立っていった。
The airplane took off with a thunderous roar.
交渉が決裂し、会議室は一気に殺気立った。
When the negotiations broke down, the conference room suddenly became tense.
Imagine something 'standing up' or 'popping up'. This is like steam rising. Or an idea suddenly appearing in your mind. It shows something new starting strongly.
This is different from 〜始める because 〜立つ means a big, strong start. It is more formal. It is like 〜出す because both mean a sudden start. But 〜出す is more common. It can be for small, personal things. 〜立つ is for bigger, more serious things. It sounds more like a book.
Don't use this when you want to make new words. For example, you cannot say "食べ立つ" (tabetatsu) to mean "start eating."
More formal alternatives(1)
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