It belongs to a phonetic family with 認 and 忍 — they share the 刃 component and the reading ニン.
A common word using 刃 is 刃 (は), meaning “blade, sword”.
Don't confuse it with 刀 and 力 — 力 (power) is 刀 (sword) with the top stroke pushed through; 刃 (blade) adds a dot
