剃
tì · HSK 7
to shave
🪒 刂 knife radical + 弟 dì (younger brother) = take a knife to it, to shave
The right side 刂 is the knife radical, doing the cutting; 弟 on the left supplies the sound. Together: a blade put to hair, so 剃 tì means to shave.
剃 — knife radical 刂 + younger brother 弟 (phonetic)
剃 is a semantic-phonetic compound: the knife radical 刂 supplies the meaning 'to cut/shave', while 弟 (dì) provides the sound, shifted to tì. Originally written 鬀 with 髟 (long hair) over 弟, it specifically meant shaving hair, especially the head.