赤子の腕をひねる、
赤子の腕を捻る、
赤子の腕をねじる
(kanji info)
あかごのうでをねじる (akagonoudewonejiru)、 あかごのうでをひねる (akagonoudewohineru)
- 1. [exp, v5r] to take candy from a baby; to accomplish something with ease; to twist a baby's arm (rare, id)