打招呼
dǎ zhāo hu · HSK 7
to greet sb by word or action
👋 dǎ = strike/do + zhāo hu = beckon — you throw out a wave to someone
打 means strike or do (the action starter), 招呼 means to beckon or call out. Together: you toss out a greeting — like lobbing a friendly wave across the room.
打 — hand radical 扌 + nail 丁
打 combines the hand radical 扌 (action with the hand) with 丁 (originally a nail), suggesting striking or hitting with the hand. 丁 also serves as a phonetic hint in older readings. The meaning broadened from 'to strike' to a general verb for many hand-based actions, like 打电话 'make a phone call'.
招 — hand radical 扌 + 召 (call)
招 is a semantic-phonetic compound. The hand radical 扌 supplies the meaning—an action done with the hand—while 召 (to summon, call) gives both phonetic value and reinforces the sense. Together they depict beckoning someone with a hand gesture, extended to 'recruit' or 'attract'.