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To end a phone call by disconnecting the line
彼は急いで電話を切った。
He hung up the phone in a hurry.
電話を切る前に、メモを取りました。
I took notes before hanging up the phone.
This phrase is commonly used in everyday conversation when ending a phone call.
In formal contexts, you might say '電話を切らせていただきます' (denwa o kira shite itadakimasu) to politely indicate you are ending the call.
Combination of 電話 (denwa, 'telephone') and 切る (kiru, 'to cut')
This phrase is used when physically ending a phone call, not metaphorically.