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to be irritated; to get annoyed; to lose one's patience
渋滞でいら立つドライバーが多い。
Many drivers get irritated by traffic jams.
遅刻されるといら立ってしまう。
I get annoyed when someone is late.
いら立ちを抑えて冷静に話した。
I suppressed my irritation and spoke calmly.