呼び捨て
よびすて addressing (someone) without using a suffix such as "-san" or "-chan" (considered impolite)
Why it means this
呼ぶ (call) + 捨て (drop, omit) — 'dropping' the polite suffix and calling someone by name alone — rude unless you're close.
Breakdown
Each character links to its full entry — origin story, stroke order, and readings.